The opal, in addition to being October's birthstone, is said to contain the allure of all other gems. This women's filigree style ring features a four-prong set genuine 6 X 4mm oval opal gemstone, accented wonderfully by two diamonds. The ring is cratfed of 10K solid yellow gold. This ring qualifies for free custom ring sizing. Size 7 is standard. When you order a custom size, please allow an additional 7-10 business days processing time.