Top 50 most expensive gemstones in the world | precious and valuable gems | HDB TV
Price Comparison (Most Expensive Substance)
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世界で最も高価なダイヤモンド!
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完璧なダイヤモンドが2,670万ドルで落札:世界オークション記録
2,492-Carat Diamond Found in Botswana
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Diamond Ring Price 💍
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World's largest uncut diamond fails to sell in London auction