December - Blue Topaz. Adorn yourself with Lafonn's birthstone jewelry. This reversible open circle pendant features Lafonn's signature Lassaire simulated diamonds on one side and a high polish finish on the other side. Create the look that suits your style and occasion by spinning the dangling center simulated blue topaz around. The pendant is in sterling silver bonded with platinum and comes on an adjustable 20'' chain. Dimensions: Approx. 16 mm (W) x 23 mm (H)