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