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Authentic vs. Treated Gems
Check Gem Information
Check Gem Information

If you are buying a gem that already has a lab report- check the information by calling the lab and verifying that this is, indeed, the same stone, and that the lab itself is well-known and well-respected. Don't assume that any official-looking report is real, since there are jewelers that fabricate reports or, in some cases, have themselves bought the gem with the report, believing its authenticity. If it is an expensive stone, and you don't recognize the name of the lab, send it for re-testing. You can get an estimate on the testing fee on the phone and decide whether the fee is worth it before sending the gem. If it's a small lab that you are unfamiliar with, call one of the big labs and ask them if they know of the place. Remember! - Authenticity of the gem isn't enough. The report should indicate the grade and quality of the gem, as this can make an enormous difference to cost and worth, also, the report should state whether the gem has been tampered with in any way. Not all treatments will de-value the stone, some mild ones may even increase its value, but most of them will significantly change the market value on the stone, and you should know all of this before purchase. The report should include: Name, logo, address and phone of the lab, certificate number and date, identification of the stone's type, its general shape and cut, its carat weight and measurements. The report should also show the color grade, clarity grade, proportions and comments. In some cases there will even be a small diagram of the stone's cut.

 

 

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