What is a sapphire and is sapphire a gemstone?

Gemstones must meet the definition: durable, rare stones with a certain hardness. That applies for diamonds, rubies, emeralds and therefore sapphires as well. After diamond, sapphire is the hardest material on Earth. Sapphires exist in many colours, but the blue variant is the most valuable. Most weigh more than 4 carat. The most valuable sapphires are found in Sri Lanka.

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