cab·o·chon /ˈkæbəˌʃɑn/
依天然形狀磨圓的寶石
ca·bo·chon n. Jewelry A stone of convex form, highly polished, but not faceted; also, the style of cutting itself. Such stones are said to be cut en cabochon.
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cabochon
n : a highly polished convex-cut but unfaceted gem