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[Crystalized] carbon. Diamond is a cubic mineral, like gold, spinel, fluorite, etc. Its ideal crystal shape is eight-sided -- two pyramids attached to each other. Its refractive index is 2.42, as opposed to cubic zirconia which is 2.15; sapphire and ruby which are 1.77; emerald, aquamarine, heliodore and morganite which are 1.57, and so on. Diamond is rated as a 10 on the Mohs hardness scale, but only because it is the only natural gem harder than corundum (sapphire and ruby) which are a 9 [on the scale]. In reality, diamond is more like a 41 -- its not just a little harder than corundum, but mucher harder. Diamonds are mined in South Africa, Australia, Siberia, Canada, Brazil and a few other lesser places. Most gem-quality diamonds mined are a light yellow or [light brown] color, but the stones [occur] naturally in every color of the rainbow, including colorless (which is the most popular for jewelry), milky translucent white and opaque black.
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