What is diamond identification?
By diamond identification GIG answers to three main questions:
- Is it a real diamond or a simulant?
- Is a Natural one or a lab grown diamond?
- Is your diamond treated or untreated?
The term “simulants” is used to indicate a material similar to the diamond for its appearance but different for chemical and physical properties. Simulants have a completely different identity. Just to mention the most common Diamond Simulants: Cubic Zirconia (CZ), Synthetic Moissanite, YAG, GGG, Strontium Titanite and Artificial Glass. An expert gemologist is able to distinguish between the Diamond and simulants by accurate microscopy observations; nevertheless, GIG internal standard procedure requires to confirm the diagnosis of Diamond imitation also by high tech analysis.
With the terms Laboratory Grown it is indicated a Diamond made by men in a laboratory. Laboratory Grown Diamond has the same chemical and physical properties of the Natural counterpart, but it has been, as said above, created by men in laboratory. The Laboratory Grown Diamonds available nowadays in the trade are made by two different synthesis methodology: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). To properly recognize it, the gemological standard tools may be not sufficient and high-tech analyses must be combined with the microscopy observations. All the diamonds analyzed by GIG Gem Laboratory have been tested for natural versus laboratory grown identification. In order to meet the needs of the diamond trade, GIG has developed a specific Report, dedicated to the laboratory grown diamonds, where is also reported by which kind synthesis methodology is made of. The laboratory grown diagnosis is reported also in the GIG laser inscription, performed with the identification code on the diamond girdle.
Finally, the diamonds treatments are distinct in two categories: the treatments able to improve or change the diamonds color and treatments able to enhance the clarity. In this second case, the most common treatments are the laser drilling and the fracture filling; if the diamond has been treated for clarity enhancement, the grade will be not declared in the GIG diamond report, according with the international standards, while the details of the treatment will be indicated. Regarding the color treatments, the possibility to induct artificially in the diamond all fancy color hues as well as to improve the colorless is a reality today. Most of cases require to combine the standard gemological observations with the last high-tech analyses, in order to diagnose the diamond color origin. The GIG diamond report will indicate not only if the color is natural or due to treatments, but also, in the case of treatment, which type of treatment has been applied to improve or modify the original diamond color.
Simulants, synthetic Diamonds or Lab-Grown and treated diamonds can be sold and bought like the natural one. It’s very important, the seller openly disclosures what it is the object of the sell. Disclosure is the key word. Simulants have their own trade and of course low prices. Compering the price of CZ with the price of natural diamond the difference is dramatic! We are talking about tens of dollars against thousands of dollars.
For Laboratory Grown diamonds and treaded diamonds we can say the same. Nowadays there is a trade dedicated to them. Many famous brands are creating jewelry collections using lab grown and or treated diamonds in order to keep the prices very low and easy affordable. At this moment a synthetic diamond could cost one fourth less than a natural one, with the same characteristics. Again, it’s very important always to declare the genesis of the diamond and eventually the presence of treatments. As a final consumer, we have the right to choose what to buy without the shadow to be cheated.
Always, as a buyer or a final consumer, demand from the seller a GIG Diamond Report before closing the purchase and avoid cheats or purchases out of proportion considering the real value of the goods.
“Lonsdaleite Diamond”: What Is All the Fuss About? Maya Musa1*, Lisa Greggio2 1 Research Department director, Gulf Institute of Gemology, Sultanate of Oman. *Corresponding author:
The Chiaravalle Cross: Results of a Multidisciplinary Study Di Martino, D.; Benati, G.; Alberti, R.; Baroni, S.; Bertelli, C.; Blumer, F.; Caselli, L.; Cattaneo, R.;