This lab-created opal necklace is a gorgeous and colorful addition to your dressy looks. Sterling silver a tilted cushion-cut lab-created opal draws the eye sparkling round-cut white lab-created sapphires surround the center in a crossover halo more white lab-created sapphires shimmer on the bail 16- to 18-inch adjustable cable chain; lobster clasp opal is the traditional birthstone for october