What are the key differences in the hardness and optical properties among various types of precious stones, such as diamonds, sapphires, rubies, and emeralds?

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on August 06 2025 at 05:27 PM in Jewelry & Precious Stones - Other

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What are the key differences in the hardness and optical properties among various types of precious stones, such as diamonds, sapphires, rubies, and emeralds?