The Colours of Love Cosmic Curve Yellow Gold Emerald Eternity Ring features twenty round Zambian emeralds set in 18 karat yellow gold. The Cosmic Curve eternity rings represent an eternal bond between family, friends and partners. The May birthstone, emerald, is associated with fertility, rebirth, hope & love. In keeping with its fondness for delight, surprise and discovery, Fabergé has concealed a ruby on the inside of the band. The ring is 6mm in width.