Bvlgari Bulgari 3.5ct Pink Tourmaline 18k Yellow Gold Tubogas Band Ring. An authentic elite collection by Bvlgari, this ring is crafted from 18k yellow gold with a polished finish, it features the famous tubogas design 9.7mm wide band and has a stunning oval cabochon pink tourmaline gemstone mounted at the front of the band. Signed by the designer with the metal content. Material: 18k yellow gold Hallmark: Bvlgari 750 Gemstones: Pink tourmaline: 3.5 carats Measurements: front: 0.32" across x 0.45" long Ring Size: 5.5 Weight: 12.6 grams Stock# 55609