Talk:Ruby Dragon/@comment-4599249-20121216201108/@comment-74.120.190.101-20121219110845

A pearl isn't a gemstone. Gemstones are created from rocks. A pearl is solidified mollusc spit. My guess is that white will be quartz. Having said that, quartz is extremely common - you're walking on it every time you go to the beach, as it's simply compressed silicon.

I also theorise that Ruby Topaz Sapphire = Jet Though, strictly speaking, it should be Ruby Emerald Sapphire (photo-chromatic primaries and gemstones reflect light). And Emerald Sapphire = Turquoise (it's not just a colour, y'know).

In the strictest geological sense, a ruby is a red sapphire and an emerald is a green sapphire; they're all formed from the same element - carborundum.

Diamonds could be possible, as they come in many colours, not just 'white': - pink, orange, yellow, and blue are all possibles, it all depends on how the diamond was formed.