Custom Designed Opal Engagement Ring. An oval Australian Crystal Opal in a Rose Gold Ring with Round Brilliant Diamonds around the Opal and down the cross over band. The Diamonds are larger at the two ends then graduate down in size A Trillion Tourmaline on each side of the band with a larger Round Brilliant Diamond below it. A unique engagement ring with natural gemstones of high quality. Proudly made by FlashOpal Genuine Gem Jewelry.