Highlight What is Agate? Agate is a remarkable variety of chalcedony, a cryptocrystalline form of quartz that occurs naturally... Read more
Course Gemology Essentials Course (Gemological Society of America) Provider: Gemological Society of America (GSA) Course Overview Explore the fascinating world of gemstones with... Read more
Highlight Disadvantages of precious gemstones Here’s a chunk in my garden. See those horizontal cracks? They look almost like... Read more
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