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It has a hardness of 8 on the Mohs hardness scale
Rhodochrosite is a bubblegum pink to rose red stone
Ametrine is quartz that occurs in bands of purple and yellow
Shungite is a black
The multi ring magnetic sliding tube clasps are great for heavier projects
Ruby (Natural) 2-6mm Graduated Faceted Rondelle - 15-16 Inch 3x4" It has a hardness ofRuby is a precious gemstone known for its deep red color. It is a variety of the mineral corundum, the second hardest mineral next to diamond . The presence of chromium is what gives a ruby its red color. Trace amounts of iron can also affect the hue, giving some rubies a slightly brownish or purplish tint. Ruby has long been considered one of the most beautiful and valuable gemstones on the planet. At times in ancient history, Ruby was valued more