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A common misconception is usually that diamonds variety from highly compressed coal. Coal is fashioned from buried prehistoric vegetation, and most diamonds that have been dated are considerably older than the very first land crops.鋸 · 磨 · 焊 · 鍛 · 拋 · 鑲 · 鍍 · 失蠟法 · 鑄造 · 浸滲 · 氧化 · 雕版Cho