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I think Chris nailed it. Here is a picture of corundum from Brazil. As he pointed out the specific gravity of corundum is 4 and is easy to check. Weigh your specimen twice. First all alone. Second put a glass of water on a scale. Then dangle the specimen tied to a thread in the water. The increase in the weight of the glass of water is the weight of the water displaced by the specimen. The ratio of the two weights will give you the specific gravity. Let us know how it comes out.

 

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Cool Australian commercial sapphire mining video...looks like they are using gold placer mining type of equipment plus eyeballing...does anybody know if sapphires glow under a UV blacklight for night time prospecting? I know some diamonds glow blue.

 

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