Why are natural rubies and sapphires so much more expensive than the heat treated rubies and sapphires?

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Why are natural rubies and sapphires so much more expensive than the heat treated rubies and sapphires?

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• Untreated or natural rubies and sapphires are just like nature made them over millions of years. Heat treated rubies and sapphires are stones irreversibly beautified by man. Even a very low quality ruby can be made attractive in a heat oven. The higher price reflects the genuine quality of the gemstone.

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