Pear shape London blue topaz ring Temple & Grace NZ Prong Set Pear London Blue Topaz Ring with Diamond Halo Pear Shaped Blue Topaz Engagement Ring, Blue Topaz and Diamonds Wedding Pear shaped London blue topaz ring vintage moon bezel unique engagemen. Sterling silver multi row ring with four pear blue topaz stones. The stones are approximately 5. 5mm x 8mm. The ring is 17mm across the front and tapers to 2mm in the back. . 925 Sterling Silver