2019 AGA Las Vegas Conference
Friday afternoon, May 31, 2019
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Worried you are selling synthetic diamonds unknowingly? Help is on the way from the AGA!

What it Means to the Gem & Jewelry Trade! Diamond Treatments Revisited: A New Study of the Behavior of Green to Bluish-Green Diamonds & their Defects when Exposed to Irradiation, Annealing, & HPHT Techniques with Dr. Thomas Hainschwang

The origin of color in green diamonds has been historically challenging to the gemological field, & remains so today. Where green diamonds are concerned, those submitting a green diamond or jewel containing one, are usually distraught to receive a report from any of the respected gem-testing laboratories indicating "undeterminable."

To help address this issue, the Accredited Gemologists Association (AGA) is especially excited about the upcoming presentation by Dr. Thomas Hainschwang at its Las Vegas conference. He will present his latest research findings & comment on how he thinks they will impact the entire gem & jewelry field.

Approximately three years ago, Dr. Hainschwang began a comprehensive research project on green diamonds, funded in part by an AGA research grant. The research was conducted on numerous diamonds, both before & after exposure to irradiation & annealing techniques, in an effort to better understand the impact of these techniques on the behavior of these diamonds & their defects. One especially notable difference between Dr. Hainschwang's study & prior studies is that the sample diamonds used in his study were all green to bluish-green in color.

Dr. Hainschwang will present his findings, with special emphasis on the final step of his study – the effect of HPHT treatment on his sample diamonds. "This final step is of great importance," Dr. Hainschwang explains, "because earlier studies have generally used only brown diamonds in their studies; using green diamonds has provided important new insights never before revealed."

According to Dr. Hainschwang, over this past year the results of his study have provided important new data leading to a much greater understanding of one of the most challenging of diamond determinations. Everyone interested in fancy color diamonds will be eager to hear this cutting-edge presentation & it's impact on the daily business of diamond testing!

Hands-on Synthetic Diamond Detection with Dror Yehuda

Building on last year's probing analysis of synthetic diamond detectors, AGA will provide an in-depth look at the Sherlock Holmes by Dror Yehuda.

Bring your own diamonds to see if you can fool Sherlock, rated highly by the Diamond Producers Association ASSURE program. Learn about the development of this tabletop unit that quickly reveals HTHP & CVD synthetics, how it is done & what challenges lie ahead as more jewelers enter this market, by design or by mistake.

Yehuda will also address the state of clarity-enhanced diamonds, a technology invented by his father Zvi Yehuda with current pricing information & detection tips.

New discoveries for Detecting Low-Heat Treatment of Corundum! with Shane McClure

Shane McClure, GIA Global Director of Colored Stone Services will share ongoing research revealing previously undetected alterations to corundum. Since treatments must be disclosed, their detection is vitally important to dealers, appraisers & consumers. See what has been revealed about Mozambican rubies & basaltic blue sapphires & get a look at features due to heat treatment with pressure.

Sapphires, rubies & other varieties of corundum have been improved through heating techniques for decades, but not all corundum is heated in the same way. Rubies & sapphires are routinely heated by medium-to-high heat methods, which are usually readily detectable by gemologists & gem-testing laboratories.

In recent years, however, this has changed. There has been an increasing number of rubies & sapphires, as well as other corundum varieties, entering the market that have been improved through low-heat methods, & sold , often inadvertently, as "natural"! Stones treated by low-heat methods are of serious concern to sellers & buyers alike because corundum treated by "low heat" often doesn't show characteristics normally seen in stones treated by moderate- or high- heat techniques. This is why this relatively new low-heat treatment has gone undetected, even by major labs, creating a situation putting the entire trade at risk. Under the law, anyone selling any corundum (or other stone) must disclose treatment – including "low heat" – because it has been altered. Period.

Fortunately, thanks to technological advances & continuing research, detection of low-heat alteration is now possible & the AGA has arranged for GIA's Shane McClure to give an extremely important , very timely, presentation—High Heat, Low Heat, or NO Heat: Detecting Heat Treatment Levels in Corundum?— at its Las Vegas half-day conference on May 31st.

Come learn how low-temperature treatments are now being detected & what to look for at each temperature range for corundum. Mozambique rubies & basaltic blue sapphires are among those being revisited with this new information. Participants will also be able to meet the speakers & continue the discussion during the cocktail period following the conference presentations.

Bring your own diamonds! Hands on Diamond Detection

Test natural, synthetic and treated diamonds with these vendors.

*This is the first conference in the USA to see this new product.