Exodus 28
16 It shall be square and folded double; a span{A span is the length from the tip of the thumb to the tip of the little finger when the hand is stretched out (about 9 inches or 22.8 cm.)} shall be its length of it, and a span its breadth.
17 Ref You shall set in it settings of stones, four rows of stones: a row of ruby, topaz, and beryl shall be the first row;