The Swiss Gemmological Institute SSEF has launched a series of free-of-charge, online courses, entitled Understanding Gemstones. The gems currently covered are diamonds, emeralds, pearls, rubies and sapphires.
The Swiss Gemmological Institute SSEF has launched a series of free-of-charge, online courses, entitled Understanding Gemstones. The gems currently covered are diamonds, emeralds, pearls, rubies and sapphires.
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