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Quantity
1
Description
Ruby is the red variety of corundum (Al2O3), one of the hardest natural minerals on Earth, ranking 9 on the Mohs hardness scale—second only to diamond.
Its vivid color comes from trace amounts of chromium, which replace a small fraction of ...
Reviews
5.0
2 ratings
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Great item for rock collectors
I have a granson who likes all rocks and crystals. This is packeged so nicely to be displayed in his collection!
L
L · 7 days ago
FULL tube of stones! Variety of sizes, tones. Fascinating information. Great price 👍