Coloured Gemstones

Precious coloured gemstones, cut from hard natural crystals and minerals, are sold in shops and by specialist gemstone dealers who focus their business on one particular stone – for example, sapphires or emeralds. Coloured gemstone fairs take place Tucson in the US, In Idar Obesteirn in Germany and Bangkok in Thailand. Many of the less expensive gemstones are treated to enhance their colour but the best stones are left untreated and are more valuable.

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