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https://geology.com/minerals/charoite.shtml
Charoite: A purple mineral, gem material, ornamental stone
Charoite is a purple silicate mineral. Rocks containing abundant charoite are used as a gem material and ornamental stone. It has only been found in eastern...
mineral gemornamental stonecharoitepurplematerial
https://www.gia.edu/gia-faq-analysis-grading-suspect-treated-gem-synthesis-disclosure
What if I suspect gem material I'm submitting has been treated or is a lab-grown product?
You are required to disclose if you know, suspect, or are unsure that the material has undergone treatment or is laboratory-grown product. Learn more about...
gem materiallab grownsuspectsubmittingtreated
https://geology.com/minerals/variscite.shtml
Variscite - A rare mineral and gem material
Variscite is a hydrated aluminum phospate mineral that is sometimes used to produce gemstones for collectors and jewelry. It is often confused with turquoise,...
gem materialvarisciteraremineral
https://geology.com/gemstones/moldavite/
Moldavite - A green gem material formed by an asteroid impact.
Moldavite is a unique extraterrestrial gem. It formed in the heat of an asteroid impact about 15 million years ago. Learn about its formation, properties,...
green gemasteroid impactmoldavitematerialformed
https://geology.com/gemstones/rose-quartz/
Rose Quartz - A Favorite Gem Material
Rose quartz is a name used for specimens of quartz with a pink color. It is a popular gem material used in cabochons, beads, tumbled stones and small...
rose quartzgem materialfavorite