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n.
a crystalline rock that can be cut and polished for jewelry; "he had the gem set in a ring for his wife"; "she had jewels made of all the rarest stones"
n.
protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior
n.
any long object resembling a thin line; "a mere ribbon of land"; "the lighted ribbon of traffic"; "from the air the road was a grey thread"; "a thread of smoke climbed upward"
n.
an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.); "they checked everyone's badge before letting them in"