Margot McKinney Jewelry opal and multi-stone ring. Polished 18-karat yellow gold band and settings. Prong-set natural lightning ridge boulder opal. Multi-size and multihued stones form border. Brilliant-cut diamonds, peridots, tsavorites and blue sapphires. 8. 97 total boulder opal carat weight. 5. 69 total tsavorite carat weight. 0. 94 total dark blue sapphire carat weight. 0. 62 total peridot carat weight. 0. 52 total diamond carat weight. Made in Australia.