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.