In some cases, tourmaline can even display multiple colors in a single crystal, known as bi-colored or watermelon tourmaline, where pink and green hues coexist due to variations in trace element ...
Three jewellery industry associations have released a joint statement expressing concern about the presence of irradiated rubies and sapphires in the global market.
The World Jewellery Confederation (CIBJO), the American Gem Trade Association (AGTA) and the International Colored Gemstone ...
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