What lab or certification is the best for checking your expensive ruby, sapphire or emerald?

Buying a high quality ruby, sapphire or emerald isn’t cheap, but how do you know the beautiful expensive gemstone you are buying is the quality you are expecting? As I have discussed in our previous blog posts, it is very important to evaluate color gemstones value base on ‘six dimensional’ criteria – origin, color, carat … Continue reading What lab or certification is the best for checking your expensive ruby, sapphire or emerald?

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