This item is crafted in solid 14k white gold with diamonds and solid Australian Lightning ridge Black Crystal transparent Opal. the opal is approx 27.5x16.8mm! approx 17.9Ct - rare large size! and is solid natural untreated Australian Lightning ridge black Opal - not doublet and not triplet not boulder but solid black opal. it has smooth polish and has no cracks no crazing. please see photo agains the light - transparent and no cracks. as with most opals the colors are stronger on the Sun and direct indoor light and not so in a dark/low light. the item as in new condition! length approx 17?, marked for 14k gold and fully tested. the diamonds aprox from 1.5 to 1.9mm - they are all different! large, well made and substantial in weight - 7.13g! please see photo. under direct light it shows some neon moving colors and in lower light it is toffy transparent color - please see photos and video. video taken under direct indoor ceiling light to show its full potential. great as a birthstone because it is untreated natural mined opal or just for an opal lover! Made in Antique Edwardian style! comes in a jewelry case! can be gifted immediately! smoke free environment and fast USA priority insured shipping! thank you!