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https://sedagems.com/blog/gemstone-information/list-black-gemstones/
Jan 15, 2019 · Black Onyx. The Black Onyx is an ancient gem used in ancient times as both jewelry and a healing stone; it is from the agate family of minerals. It is a solid Chalcedony of microcrystalline quartz. It has a dark base with a white layer of Chalcedony.
https://www.gemselect.com/gem-info/black-gemstones.php
Jan 11, 2019 · Black jasper gemstones earn a 6.5 to 7 out of 10 on the Mohs scale of hardness. Jasper quartz is perfectly suitable for any type of jewelry design imaginable; including, pendants, necklaces, and rings. Jasper has the durability and hardness required for mainstream jewelry, making it …
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