Inadmissible Evidence

Retailers and suppliers buying and selling “no heat” sapphires and rubies may be in for a rude awakening if gemologists determine a way to identify low-temperature heat treatment. Some stones with “no evidence of heat” written on their gem-identification reports could be reclassified as “color enhanced by heat,” turning pricey natural-color gems into not-so-pricey heated ones. If a report includes the phrase “no evidence of heat,” it doesn't guarantee the stone hasn't been heated. It simply means there is no evidence the gemstone has been heated. Colored-stone suppliers should understand that such wording does not grant them license to write “no heat” on parcel papers or receipts. “Whether or not a stone is described as 'heat' or 'no heat' has not so much to do with the temperature as it does with whether or not the labs can detect it,” writes Dr. John Emmett,

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