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- Sep 20, 2008
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The best way to find out how valuable a stone is is to get a reputable lab report identifying all of the treatments on it, then send it to a highly knowlegable gemologist like Richard Sheerwood, to ascertain the value based on the quality and treatment of the stone. Often times, past auction estimates on similar stones are used to ascertain value on a certain piece. For example, the value on a 3 carat untreated Burmese ruby of top quality can be researched using auction estimates (Christies and Sotheby's for example). The appraised value is the insurance replacement value, which is a certain percentage above the auction estimate. Diamonds are by far, the easiest stones to appraise. A particular colored gem needs to be evaluated by a gemologist that is very familiar with them, as Richard stated in his article above.