Bring classic style to your look with this east to west-set lab-created opal and lab-grown diamond-frame necklace. 10K yellow gold 6.0 x 4.0mm emerald-shaped lab-created opal cabochon Lab-grown diamonds; F colour/SI2 clarity 0.10 ct. t.w. of lab-grown diamonds 18.0-inch rope chain; spring-ring clasp Opal is the traditional birthstone for October