cabochon /ˈkabəʃɒn 
/ ▸ noun a gem that has been polished but not faceted: two big ruby cabochons
[as modifier] a necklace of cabochon rubies.
– PHRASES en cabochon (of a gem) polished but not faceted: precious stones en cabochon.
– ORIGIN mid 16th century: from French, diminutive of caboche ‘head’.
EnglishOxford Dictionary of English
