RARE Technibond Blue Topaz and Opal Ring Size 7. Design Information: ring features rectangle prong-set blue topaz at center with prong-set pear-shape opals on each side of ring; Measurements: Approx.1-1/4"L x 1"W; Shank 1/8"W. Metal Type: Yellow Technibond; Metal Stamp: .925; Finish: Polished; Country of Origin: Imported