10k White Gold Round Checkerboard Cut Gemstone Pendant Necklace (8mm) Classic and versatile gemstone pendant, ready for anything the day brings. Pendant necklace feature 8mm Blue Topaz center stone. High polished 10k White Gold four prong setting with 18 inch box chain. Blue Topaz is December's birthstone. The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture.