Quick View Compare 7 Count 24x24mm Black Onyx Matte Finish Overlap Squares $21.00 Size: 14mm-L x 24mm-W x 6mm-DQty: 7 Beads / Length: 5.5 in.Weight: 54 g. Onyx, as a name, has it's origin in Greek meaning "fingernail". This is probably because of it's weak transparency. This stone is usually banded whites, blacks and grays... 0 Add to Cart