From caphar; a gem (perhaps used for scratching other substances), probably the sapphire -- sapphire.
see HEBREW caphar
סַמִּיר noun [masculine] sapphire, perhaps also lapis lazuli (compare DiExodus 24:10 NowArchaeology i. 131) (Late Hebrew id., and סַמְמִּירִינוֺן; סַמִּרִינוֺן ᵑ7; ᵑ6 ; loan-word from Sanskrit canipriya according to LagGes. Abh. 72 LewyFremdw. 56 compare Greek σάπφειρος); — absolute ׳ס 24:10 8t.; pluralסַמִּירִים Isaiah 54:11; Song of Solomon 5:14; — with other jewels as ornaments of prince Ezekiel 28:13; in high priest's breastplate Exodus 28:18; 39:11; found in mines Job 28:6, costly 28:16 compare Isaiah 54:11; taking high polish Lamentations 4:7 (in figurative); סַמִּירִים מְעֻלֶּפֶת שֵׁן Song of Solomon 5:14 ivory covered with sapphires (in figurative); lapis lazuli, according to Hi BU Du and others in Job 28:6 (לוֺ זָהָב עַפְרֹת being understood of sparkling crystals of iron pyrites in this), but see Di; lapis lazuli may be intended in הַסּ ׳לִבְנַת Exodus 24:10 (J) pavement of sapphire (in theoph.), compare ׳אֶבֶןסֿ Ezekiel 1:26; 10:1.