שָׁמִיר‎ (shâmîyr|shaw-meer'|noun|masculine|thorn)
[Heb] שָׁמִיר‎ ETCBC: שָׁמִיר‎ (subs|thornbush), שָׁמִיר‎ (subs|diamond) OSHL: v.eh.ac TWOT: 2416a GK: H9031, H9032 Greek: ὕλη
Derivation: from שָׁמַר‎ in the original sense of pricking;
Strong's: a thorn; also (from its keenness for scratching) a gem, probably the diamond
KJV: adamant (stone), brier, diamond.