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Guide to Interpretation of Yehuda Sherlock Holmes results
This guide is an essential source of information for anyone using Yehuda Sherlock Holmes to detect synthetic diamonds.
Detecting laboratory diamonds in practice: interview goal deljanina and Guye Borenstein
Gemologists Branko Deljanin and Guy Borenstein discuss key topics and challenges in identifying modern laboratory diamonds, including testing of free and set stones, limiting conventional methods, or having to combine advanced techniques. Both experts emphasize that to maintain consumers' trust, the development of increasingly precise methods of detection of synthetic diamonds is necessary.
Determining the origin of the diamond using CPF (crossed polarization filters)
The CPF method uses observation of birefringing in diamonds between crossed polarizing filters to distinguish natural and synthetic stones according to typical patterns. While natural diamonds show strong irregular birefringing, synthetic have either no or regular birefringing. CPF is a quick technique for initial diamond screening, but more advanced spectroscopy is needed to confirm synthetic origin.
Two types of Lab-Gown Diamonds: HPHT & CVD Synthetic Diamonds
The HPHT method creates diamonds by crystallizing carbon at extremely high pressure and temperature, while the CVD method by grows from the gaseous mixture deposits carbon atoms on a diamond substrate. Synthetic diamonds can be distinguished by natural fluorescence, phosphorescence or growth sectors, for example, there are many available devices for reliable distinction of natural and synthetic diamonds.
Diamond detective
John Chapman has developed a device to distinguish natural and synthetic diamonds using his expertise in physics and gemology. The video series "Detective Diamonds" shows the use of devices such as Jewells Inspector and Melee Inspector, for analyzing diamonds Jill. Chapman's Gemetrix company is headed by advanced tools that help reveal the true identity of diamonds.
Types of diamonds and use in screening methods
Diamonds are divided into types according to the presence or absence of nitrogen and boron in a crystalline grid, which determines their rarity, color and conductivity. While the type Ia with nitrogen is the most common in natural diamonds, the type IIB containing a boron is a blue to gray conductive diamond. Type identification using instruments such as Presidium Synthetic Diamond Screener is one of the first steps in distinguishing natural and synthetic diamonds.
History Lab-Grown / Synthetic Diamonds
American scientist Tracy Hall in 1954 successfully synthesized the diamond in General Electric laboratories, starting the era of industrial production of synthetics. To improve quality and price reduction, it is now necessary to be able to verify the origin of the diamond. However, there are reliable methods for detecting these laboratory diamonds.
Screening VS Identification of Laboratory Diamonds
Screening quickly and cheaply filters out suspicious diamonds, while identification slowly and dearly determines the origin with certainty. The combination of both approaches provides optimal speed, price and reliability in detecting synthetics. The differences in the purpose, speed and price make screening and identify the complementary methods of diamond verification.
Assure Program: Independent Authority for Verification of Detection of Synthetic Diamonds Detection
Assure program is a thorough test mode for devices verifying diamonds, providing accurate and reliable results from an independent third party.
