This ring is super beautiful and in excellent condition! Solid Australian black translucent Opal is set in solid 18k white gold with natural white crisp shiny diamonds around! opal is solid Australian and not doublet or triplet. see last photo against light for translucency. it is substantial size - please see photos! opal is 15.3x13.5mm approx. diamonds are around 0.30TCW weight of the ring is 5.46g; well built -the band and all of the construction is solidly made! Size 8.5USA and can be sized by your local jeweler. the opal has no cracks, no crazing, no scratches! Opal is October birthstone. This stone is natural Australian opal and untreated! comes in a ring case! smoke free environment and fast shipping! thank you!