This stud earring Made with brilliant and fiery created White Opals! Opal is October’s Birthstone.This is a Round rose gold tone created opal stud earrings. This Rose gold tone stud earring is 8mm size,also we have 7mm .Please message us if need smaller one. This stud earring Includes Gift Packaging. Perfect Gift for Birthdays, Anniversaries, Wedding Party, Holiday, Graduation etc. In the Middle Ages, Opal was considered a stone that could provide great luck because it was believed to possess all the virtues of each gemstone whose color was represented in the color spectrum of the opal.