What are the differences in chemical composition and physical properties between precious gemstones (like diamonds, rubies, emeralds, and sapphires) and semi-precious gemstones?

What are the differences in chemical composition and physical properties between precious gemstones (like diamonds, rubies, emeralds, and sapphires) and semi-precious gemstones?
Admin on June 01 2025 at 11:54 AM in Gemstones
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