钻石
zuànshí · HSK 7
diamond
💎 钻石 = 钻 drill + 石 stone: the stone hard enough to drill through anything
钻 means to drill or bore, and 石 means stone or rock. A diamond is the stone so hard it cuts and drills everything else, which is also why it serves as the tiny hard jewel-bearing inside a mechanical watch.
钻 — metal radical 钅+ 占 (phonetic)
A semantic-phonetic compound. The metal radical 钅(金) signals a metal tool or object, while 占 (zhān) provides the sound. Originally meant a metal drill or auger; by extension, to bore or drill through. The traditional form is 鑽.