How to tell diamond cut quality is good or bad by naked eye

Diamond cut quality of many of our friends do not know how to distinguish between some basis for the issuance of the certificate of authenticity, some based on the seller's instructions, then our eyes are not can not distinguish between good and bad it? In fact, the cut is good or bad is the ability to use our most intuitive visual effects to be judged. How to see the quality of the diamond cut? Here are a few places to note as long as you look carefully will be able to find good and bad.

1, the mesa and the facet of the faceted diamond is straight, there is no buckling phenomenon, realized Granville reflected image having a straight edge surface is not deformed, while the imitation or bad diamond cutting and grinding occurs effect countertops buckling.
2, angular edges and corners of the diamond is straight and sharp, standard round diamond-shaped cut diamonds, three or more edges strict handed point and form a sharp angle, and two small facets strictly intersects with a the ridges. With similar imitation diamonds, due to the low hardness, poor cut, often angular sleek.
3, waistline standard round brilliant diamonds, waist after coarse grinding is usually not polished. This smooth waist called "saccharification" effect "mashing" waist typical diamond cutting and grinding characteristics, performance the Wei waxy reflective phenomenon. Most imitation waist with polishing, polishing lines visible under a microscope.
4, the polishing marks polishing marks appear nearly parallel fine scribe lines, good polishing due to the high hardness of the diamond can be formed, therefore, in the diamond facet the most invisible polishing marks, but sometimes polished not refined , the visible fine polishing marks. Above can make some observations consumers self-identify diamond cut is good or bad, the color of fire cut fine diamonds issue forever shine, the bad cut diamonds would not have so flash color of fire.

Easy to distinguish between diamonds and fake ones

The diamond's main features are: excellent thermal conductivity, a high hardness, typically adamantine luster beautiful pastel dispersion, high refractive index, a homogeneous body, sharp engraved personally upon rib as well as the standard cut diameter and weight of the corresponding sex. Identify the genuineness of the diamond generally start from several angles.
First introduce several daily life more simple, without the help of a professional tool for the identification of methods:


I 〖stroke, identification method〗
Due to the lipophilicity of the diamond, you can oil pen (or pen) at the counter of the diamond plan, rest assured, genuine diamonds will not leave scratches, draw the line is coherent, real diamond no significant line or discontinuous, is likely to have a problem (taking into account the quality of a ballpoint pen, you can draw a few times).


II 〖breath identification method〗
Good heat transfer capacity of natural diamonds, heat scattered quickly. To test the diamond near the mouth gently exhaled air tested diamonds cast a mist, then immediately watched the mist of the diamond volatile situation for natural diamonds, the fog will immediately dispersed, and vice versa will fog remain for some time, will be dispersed in the counterfeit diamonds.

III〖Dripping identification method〗
The upper facet of the diamond wipe clean with the end of the toothpick dip drop of water droplets on it, real diamonds on the water droplets will show moderate small round drop shape. Fake diamonds on the water droplets will spread quickly.

IV〖Pencil identification method〗
Diamond moistened with water, using pencil carved on it, real diamond surface without leaving traces of pencil across. Transparent crystal, glass, tourmaline fake diamonds will leave marks.

V 〖to characterize identification method〗
The hardness of diamonds are strong in the top left, blades, and other difficult nicks. In addition, the diamonds in the glass gently draw, will leave an obvious white marks. Fake diamonds are no such phenomenon.

VI 〖light resistance identification method〗
Real diamonds with single refraction, radiant, dazzling brilliance of the characteristics on the hands you can not see the hand lines. Crystal posing as fake diamonds, its dispersion, low refractive index, visible through the crystal, hand lines.
Diamond wipe countertops (Diamond biggest facet) down on a piece of paper of lines, diamond cut standard of comparison, through diamonds to see less than lines on paper, while the vast majority of imitation Products allows sufficient light to pass through, at least part of the line can be seen.

VII 〖hand touched identification method〗
Because diamond oil kind of affinity human finger skin secretion of some trace grease with your fingers to gently touch diamond crystal face, there will be a sticky feeling. With a magnifying glass, but this method requires some experience, try a few times by hand to slowly cultivate a feeling. For polished diamonds inlaid hand touch, take a magnifying glass to view, you will find the diamond the the diamond substitutes or other precious stones stains more grease.

VIII 〖contact identification method〗
Diamond is crystallized carbon, excellent thermal conductivity paste Touch Diamond, tongue, cheeks, back of the hand, the human body is a constant temperature, if the diamonds will warm up, and that is imitation. Real diamond paste touch for a long time it is cold.

Let's introduce some identification with the professional tools or complex point:

IX 〖cut mirror identification method〗
Diamond cut mirror to observe, within the natural diamonds will find bright, has many complex facets. And other counterfeit goods bland, cut, or even can not see.

X 〖thermal conductivity meter identification method〗
Identify genuine and fake diamonds accurate and reliable diamond tester (ie, thermal conductivity meter) measured the thermal conductivity of various diamond substitutes or counterfeits distinguish between true and false diamond problem solved. Diamond thermal conductivity meter to detect the maximum thermal conductivity of diamond this feature, if it is a natural product, thermal conductivity meter can be called a beep and red, which is the most accurate and convenient method for the identification of diamonds.

XI 〖hardness tester identification method〗
Standard hardness tester to measure the hardness is also simple and reliable method of identification of diamonds. Standard hardness tester is a size of only 65 × 55 × 23 mm rectangular box, lifted the lid, inside lined with four precision-ground, surface smooth as a mirror standard hardness piece Mohs hardness were 6,7,8,9. Characterize the hardness of 9 standard piece can draw scars is a real diamond, where the program does not automatically prove its hardness is less than 9 or equal to 9, are fake diamonds diamonds.

XII 〖certificate query identification method〗
Purchase polished diamonds inlaid jewelry merchants usually jewelry certificate of authenticity. This is the most accurate and detailed quality description of the diamond. The appraisal certificate provider with industry professionals, the reliability of the certificate can simply related sites to check the authenticity of a position of authority. As long as the query to relevant sites jewelry appraisal certificate number, and basically do not doubt the authenticity of the diamond

How to distinguish between natural diamonds and their imitations

In general, natural that non-artificial. The DIAMOND (natural diamond) word in the U.S. Customs Service, Customs Import Tariff understand the label, as long as it is a naturally occurring, that is, via the way of exploitation of diamond surface inside or outside, was able to use DIAMOND word.
Taiwan market often hear "Soviet diamond," Swiss Diamond "Taiwan unscrupulous businesspeople result of the abuse of the word" drill "For fuzzy definition of" Diamond ", in order to achieve the purpose of conducive to sales, in fact, like the Soviet diamond," Thai white diamond "can only be called natural diamond imitations, because of their fundamental and natural diamonds is completely different substances, composition, physical and optical characteristics are completely different, do not be misled. Import tariff in the United States, Taiwan's called "Soviet diamond" only "Cubic Zirconia" (zirconia), scientific name marked, and shall not be used other names. The same can only use the "Cubic Zirconia" or simply "CZ" sales and sales in the U.S. market
Diamond imitations of the common market following four
Swiss Diamond (strontium titanium stone, strontium titanate chemical composition SrTiO3)
American drilling (yttrium aluminum garnet YttriumAluminumGamete, the chemical composition of Y3Al5O12)
Soviet diamond (cubic zirconia chemical composition of the zirconia ZrO2)
Mount DiamondMax (the synthetic silicon carbide SyntheticMoissanite of chemical ingredients SiC)
Mount DiamondMax "currently on the market often hear," Soviet diamond, "Diamond", "Swiss Diamond", etc., are not diamonds, they just look after Cutting diamonds are extremely similar in their physical and chemical optics, crystal structure, and other characteristics and natural gemstones are not the same case, we can also use different identification methods to distinguish the authenticity.
Tell drill its imitations
A perspective test method:

Down on the diamond desktop wrote a the black font book or newspaper, try to see the word whether through diamonds. Round drill through a good proportion of Cutting absolutely can not see under the black font, it is because of the high refractive index of diamond sake, so in case of a high refractive index imitations, such as Mount DiamondMax (Moissanite ), this method can not distinguish.

Second, the appearance of discrimination

The diamond the United States from its light generated special effects, the effects of this light is what we often call light, fire and flash.
Light is reflected by the diamond internal and surface total amount of light to the naked eye, and the refractive index of the gem, the higher the refractive index of the gem, the light, the stronger the diamond drilling Soviet Union and Switzerland drilling refractive index are quite so light also Almost American diamond and crystal refractive index is smaller, so the light is poor.
Fire, also known as the Rainbow light is called dispersion on the optical, is white light dispersed into the colors of the ability, the diamond has a higher dispersion than the average stones, so when we see a rainbow light, often mistaken for the body color. The Diamond and Soviet diamond dispersion equivalent to the U.S. drilling poor, five times the the Swiss diamond dispersion rate of about diamond, so very bright, but not really, it is easy and Diamond distinguish.

Flash faceted, catching the light when the diamond rotation leaving faceted issue.

Third, the diameter and depth of the formula to count the weight

Natural diamond cutting ratio and proportion, so the formula can be used to obtain the weight to identify its authenticity. If you calculate the weight and the actual weight difference, the difference is greater than or less than 5%, then there are two possibilities: one diamond turner bad, and the second is that it is an imitation goods.
(Circle drill) diameter and depth of the formula to count the weight / weight = (average diameter) 2 × total depth × 0.0061

Fourth, the magnifying glass feature
High hardness, the diamond cutting and grinding after facet is extremely smooth and faceted faceted phase of very sharp ridge. General imitations, hardness is lower, so the ridge blunt, or even have a lot of bumps gap. (Example: zirconia stone is common in the Soviet diamond)
The ridge between facet faceted diamond watch with 10 times magnifier sharp.
The higher hardness gem cutting and grinding lines more sharp and easy to scratch. See the edge of the facets obtuse or scratched up, we have to be vigilant. The premier diamond hardness, diamonds can be each other scratches, other gems can not damage its surface scratches opportunity relative reduction (Diamond ruby ​​and sapphire hard 140 times), on the contrary, other precious stones, or imitations facets of the edge of the circle the blunt and extent of surface scratches and opportunity to greatly increase than diamonds.
10 times magnifying glass to watch the natural surface of the diamond (naturals)
Diamond waist can often find the natural surface of the diamond, the cutting master in order to retain more diamond weight and stay, these natural face not only the characteristics of the diamond, and is also used to prove that the best evidence of the natural diamonds.

10 times the magnifying glass to see the diamonds single refraction or birefringence
Natural diamonds belong to a single refractive gem, synthetic silicon carbide (MOSQUE stone) is the birefringence. Tenfold magnifying glass to read on the pavilion desktop from Diamond to be seen in the end near the tip of the ridge the ghosting or partial some angle since the kite surface can also be found in the end tip of the ridge near the ghosting phenomenon synthetic silicon carbide or other gems, without birefringence natural diamonds.


V. Fluorescent
Fluorescent longwave radiation, "Soviet diamond was orange reaction, the reaction of the diamond is not, or blue, or yellow-green or no response, take a look at the whole batch of diamonds, can be irradiated with a fluorescent lamp, If mixed with the Soviet diamond can quickly tell the difference, but this way is not 100% accurate.

6, thermal conductivity probe

The diamond heat conduction is the best variety of substances, than gold, copper and other metals, the use of this feature can use the thermal conductivity of needle test, but due to the advancement of science and technology, thermal conductivity for a new generation of diamond imitations synthetic silicon carbide (commonly known as Mount DiamondMax) test but also presents a real diamond reaction seen this method is for reference only.

VII, X-ray discriminator

Diamond component is carbon, X-rays can penetrate most of the imitations components such as silicon or aluminum X light is not easy to penetrate, to take advantage of this feature can distinguish between natural diamonds and imitation, but the X-ray identification expensive and long-term exposure to harmful X-ray, so relatively few people using this authentication machines.

Eight, the proportion of liquid

Natural diamonds and other precious stones or imitations neither the same proportion, so the proportion of liquid to distinguish, but limited to Mosaic gems, such as diamonds accounted for 3.52, the synthesis of silicon carbide (commonly known as Mount DiamondMax) The specific gravity of 3.22, when the proportion of liquid 3.30 diamonds into the specific gravity of the liquid, the diamond will sink into the specific gravity of the liquid in the synthesis of silicon carbide (Amos xingzuan) is floating on the surface. (Diiodomethane proportion of liquid chemical composition, a highly toxic, so be especially careful in use.)

However, this method is also provided for informational purposes only, rank and file but also other methods can be identified, accounted for more than 3.3 gem will sink to the proportion of liquid.

How to Choose Diamond

Since the fifteenth century, the diamond ring from a symbol of tolerance, be regarded as eternal and steadfast Covenant marriage, so the wedding has been playing an important role to play. Choose to 4C-carat diamond weight (carat), color (color), Clarity (clarity) and Cut (cut), as the GIA diamond buying bare measurement conditions. 
Carat weight (carat): calculation of the weight of the diamond units as "carat", the unit price per carat is different, the more carat weight, the higher the unit price. 1 carat is equivalent to 100 points, a 0.5 karats of diamonds, can be written in 50 minutes. Big stars of the diamond rather rare, so precious relative. Although 4C in a carat weight of the most easy to grasp, even if the same two carat weight of diamonds, the value will be different color, Clarity and Cut and different. 
Color (color): the color of diamonds range from the most expensive rare complete colorless to yellowish-brown, and different shades of color. And getting in the near colorless diamonds, the more easy for light to penetrate and distribute in the crown of the colorful rainbow color. Set color levels based on the English letter D (colorless), headed by its brightness is the highest; and the English letter Z (yellow) is the color of the worst series; However, usually in the N (yellow) The following grading of diamonds, their mutual difference between the price a little. 
Clarity (clarity): a net grade of classification is entirely internal defects and external defects of the size, type, quantity, color and location to determine it is in one class to which they belong. Net grade is divided into 5 major categories, 11 grade, that is, 10 times the magnification of their flaws down to view the extent of grading. 
Cut (cut): Many people often diamonds Cut and shape of confusion. In fact, diamond is the diamond lathe worker cutting surface. No matter what kind of shape, as long as it is a beautifully cut diamond, is a masterpiece of the south-pointing carriage cutters. Because a properly cut diamond, you can gather more light, more light reflection, but also given a higher value diamonds.

Diamond maintenance

After the purchase of diamonds, if proper maintenance, will make it pale. Although diamond is the hardest natural material, but the Diamond still has to split the four directions, so should try to avoid collision with the hard things at the same time, should also avoid wearing the same two ring fingers, so as to avoid friction between the diamond. The ornaments are kept separately to avoid collision with each other hard surface of the diamond scratch other jewelry. 
(1) cleaning fluid wash Act: a small bowl or cup containing warm water, in water stressed good amount of neutral detergent. Baptist will be the diamond in water, gently scrub with a toothbrush, and then a net sieve, under the faucet with warm water rinse. Finally with a soft, lint-free cotton drying can. 
(2) cold flooding method: use a small bowl or cup, will be the diamond Soak about 30 minutes, and then use a small brush in gently scrub the diamond around, and then one will be waving in the water, out of paper tissues drying can be. 
(3) rapid cleaning method: buy a bottle of brand-name jewelry cleaner fluid, together with the bundle of container, follow the instructions to wash the diamond. 
The diamonds embedded in a protective framework, regularly worn in the fingers, you can keep your diamond intact for life. In day-to-day wear, your diamonds accessible perspiration and daily chemicals, easily lead to your diamond surface bleak. To carry out regular cleaning of the diamond so as to maintain the brightness of the diamond. 
In addition, the diamond is lipophilic, it should avoid taking a bath, wearing a diamond ring or housework, washing dishes or doing menial not wearing diamonds, diamonds Although hard, but the direction by Texture Based on the hit may be scratched. If inadvertently dirty, might start with a little water added to soapy water, then put the diamond, and then to soft brush gently stains on the diamond, and then a soft cloth to dry. Regular cleaning can maintain the luster and brightness of diamond. Is recommended once a month or the time may be handed over to professionals to clean.

Diamond purchase and maintenance

4c-measured value of the standard diamond 
The so-called 4c, ie the number of carats, Clarity, Color and Cut. Generally speaking, the greater the number of carats of diamonds, the higher the value, while apart from a few carats, we must also consider the diamond net, the color and the quality of Cut, Diamond Clarity refers to the number of inclusions, some inclusions hidden in the diamond without a slight crystallization of carbon material, diamond with fewer inclusions the more valuable the value for the color of respect, if not color diamond, diamond white color near the more the better, a white top for the very gifted, and Cut fine diamonds, can accept the crown of light diamond, reflex to each face, the final out from the crown refraction, reflection of light, the more will be shown by dazzling diamonds. 
Cai fire from a good cut 
The selection of diamonds, must be your favorite one, including the ring shapes that circle the size of the rings theme overall sense of meaning as well as the ring with his own hand-type with, etc., followed by the diamond cut, a good cut diamonds luster better show, the simplest way is to ring worn on the hands, gently swaying, eyes in the ring is above, a good cut can make diamonds out of colorful reflection of the fire (known as the color of fire) . And wearing ornaments before hand whether or not to try loose diamonds, diamond ornaments usually do not stack together, but also regularly clean the surface of the diamond. 
Diamond cleaning and maintenance approach 
First diamond jewelry on the Sheng has a mild cleansing agent and the small dishes in soapy water for about 30 minutes, and then use a small soft brush gently scrub, then rinse water, and finally wiped with a dry cloth; the simplest way is to use soap Incidentally, when you wash your hands scrubbed. Also recommended every six months will be sent to diamond jewelry jewelry shop for professional cleaning to regular security brilliant sheen.

Polishing and symmetry of diamond

Symmetry of the diamond polishing and cutting process of the two major areas of assessment. Grades on behalf of a diamond polishing the surface of all Facet state, and the symmetry of the diamond grading including the proportion of precision, balance and carved the face of the diamond should be accuracy. Good polishing will release the most glorious and fire. And good symmetry can make the diamond brilliance, fire and scintillation to achieve perfect balance. Polish and symmetry grades are clearly listed in the GIA and AGS guarantee book.

Such as to find the most beautiful diamonds, look for GIA excellent polish and symmetry grade (EX), very good (VG), or good (G diamond grading); or AGS polish and symmetry grades ideal (ID), a very good (EX), very good (VG), or good (G) diamond rating. There can be avoided as far as possible (F) or poor (P) polish and symmetry grades of diamonds, because of the proportion or Facet asymmetry may seriously affect the light in the direction of the diamond with the conduct, thereby affecting the diamond glory.

The proportion of diamonds

Ideal

 Ideal ratio of the diamonds, the viewer's eyes can be seen from the desktop color reflects the largest and fire. 

 Shallow

 Photoelectron by the diamonds out of the bottom of refraction, so that the diamond look without the fire. 

 deep

 Light refracted out of the edge of the diamond, so that the diamond looks bleak without glory. 

 The proportion of diamonds, especially the depth and the ratio of waist circumference, diameter, and the desktop in diameter with the ratio of waist diameter. These two factors will determine how light the diamond surface reflection and internal refraction, in other words the decision of the diamond brilliance and fire.

Parts of Diamond

Diameter: 

 Diamond waist measurement when the width of the proceeds. 

 Desktop ︰ 

 The largest diamond Facet. 

 Crown ︰ 

 The upper half of diamonds from waist to extend to the desktop. 

 Waist ︰ 

 Diamond in the widest part of a circle. 

 At the bottom of ︰ 

 For the latter half of the diamond, from the waist at the end of the extension to Tsim Sha Tsui. 

 Tip at the end of ︰ 

 Precious stones at the bottom of Facet. Usually more popular is the naked eye can not see the sharp end (from the Small to None). 

 Depth ︰ 

 A high degree of precious stones, from the desktop until the end of the distance between Tsim Sha Tsui. 

 Cut diamond - its roundness, depth, width and Facet of uniformity will affect the diamond's brilliance. Only Cut in 4CS inside can affect the human factor. Identification of the division and many also believe that the impact of the diamond value Cut is the most important factor, because even if a diamond has the most perfect color and clarity, unsatisfactory Cut diamond will also appear bleak.