Corundum itself is not a very rare mineral, but transparent gem-quality corundum is extremely rare. Most corundum is opaque to translucent and heavily included, suitable only for industrial use, including the production of abrasives used for sandpaper and machining of metal, plastics and wood, and as of recently, has become very important in the making of mobile phone components. The name 'corundum' comes from the Sanskrit word 'kuruvindam', meaning "ruby sapphire", which are the two distinct members of the corundum family.
Ruby is red corundum, while all other colors are referred to as sapphire. Blue sapphire and red ruby make up 2 of the 'four precious gems', which also includes green emerald and diamond. While there is no definitive distinction between red ruby and sapphire; in many cases, a near-red sapphire may be classed as an inferior color grade ruby. Thus, it is usually more common of practice to trade near-red sapphires as 'high-grade' fancy sapphire, rather than as 'low-grade' ruby. The corundum family includes variations of ruby and sapphire, including color change sapphire, star sapphire and star ruby. Ruby is also found in mixed gems such as ruby-zoisite and ruby-in-fuchsite.
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Gemselect had such a fantastic selection of all gems I could want, in pairs, lots, or singles, and if I wanted some gems to be just 1/10th of a millimeter bigger or smaller, they had that variance also, which is massively helpful for the specific pieces I make with their gems. I could even select different qualities of clarity and tone, which really helps my projects a lot too. I never regret a purchase made from gemselect, they help me run my custom jewelry business better with their products.
I was looking to get some stones to help turn into a necklace for my daughter, but other sites didn't have exactly what I wanted, I found it on GemSelect though, and I think it will turn out really really well!
Once again, the picture of the gem shown did not match the stone I received. I believe they are the same stones, but the pics shown were enhanced some way to show the beauty and coloration of the stone. I could NOT see the coloration. I should have realized that would happen.