- This examines famed gemstones like the Hope Diamond or the Koh-i-Noor and the legends, curses, and history tied to them. 5. **What are the most common gemstone treatments, and how do they affect a stone's appearance and value?

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- This examines famed gemstones like the Hope Diamond or the Koh-i-Noor and the legends, curses, and history tied to them. 5. **What are the most common gemstone treatments, and how do they affect a stone's appearance and value?