Opal & Diamond Men's White Gold Oval Ring This opal and diamond men's ring is crafted of cool, gleaming 10K solid white gold for a truly distinctive look. A created 7 X 5mm oval opal gemstone is accented by two white round diamonds. This ring weighs a very comfortable 3.8 grams. Opal is the birthstone for October. This men's opal & diamond oval ring qualifies for free custom ring sizing. Size 10 is standard. When you order a custom size, please allow an additional 7-10 business days processing time.