Colored Stone Guide: Important Gemstone Groups
Today, there are over 130 different varieties of precious and semi-precious gemstones available. Many of the different gemstone types belong to a larger common family or umbrella group of related gems. Gemstones from GemSelect In many cases, gemstone groups are based on physical properties, such as water content or optical phenomena, for example, cat’s eye gemstones, rutilated […]
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