diamantine
adjective/ˌdaɪəˈmæntiːn/
/ˌdaɪəˈmæntiːn/
(specialist)- made from, or looking like, diamonds
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- very hard or strong
Word Originmid 16th cent. (in the sense ‘hard as diamond’): from French diamantin, from diamant ‘diamond’.
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diamantine