![]() The red color of rubies is caused by the presence of chromium. Impurities in the mineral cause it to take on different colors. Red corundums are rubies, and blue corundums are sapphires they have the same chemical composition. What are rubies and sapphires?īoth rubies and sapphires are variations of the same mineral, corundum. Learn more about the composition of rubies and sapphires, and how much these rare gems are worth. However, both gems are widely synthesized and quality synthetics of both can be bought for under $500. Though rubies and sapphires are variations of the same mineral, natural rubies are far rarer than natural sapphires and considerably more expensive. Rubies and sapphires are rival emeralds in their popularity and stunning colors, and are widely synthesized – but which is more expensive?
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