Tourmaline is boro-silicates mineral of the cyclosilicate superclass. Tourmaline group has a vast color range and uses as a gem.
Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
Ruby is a precious gemstone, which is mostly seen in pink to dark and deep red. The name ruby is derived from the Latin word Rubeus. In ancient Indian Sanskrit, ruby is called Ratnaraj, which means "king of precious stones".
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