Top 10 Varieties Of the Gemstone SapphireMetal_Treasure Sapphire can occur in almost all colors except red.
Sapphire hardness on Mohs scale is 9 /10 (one of the best ever, 3rd hardest gem after diamond and moissanite).
The Top Ten
Star Sapphires have rutile needles inside responsible for the amazing optical effect called asterism (star-like effect). - Metal_Treasure
It's a pink-orange sapphire, which is the rarest color of sapphire. Most jewelers never seen one. - Metal_Treasure
Sapphires that exhibit two or more colors within a single stone (mostly found in Australia) - Metal_Treasure
It's Colorless Sapphire - can be used as a diamond alternative - Metal_Treasure
Related ListsTop 10 Varieties Of the Gemstone Tourmaline Top 10 Varieties Of the Gemstone Topaz Top 10 Colorless Gemstone Varieties Top 10 Very Rare Color Varieties Of Particular Gemstones Top 10 Gemstone Varieties of the Mineral Beryl
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2. White Star Sapphire
3. Padparadscha Sapphire