This item is crafted in solid 18k white gold with diamonds and solid Australian Lightning ridge black Opal. the opal is approx 16.2x8mm 2.45Ct 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 on front and has no cracks no crazing. please see video near window how it reflects the light - highly polished surface!. 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 15.5-16". total lenght of pendant approx 27mm and both marked for 18k gold and fully tested. the diamonds are crisp and white! comes together pendant and chain - as shown. comes in a jewelry case! can be gifted immediately! smoke free environment and fast USA priority insured shipping! fast priority international shipping - please choose at the checkout! thank you!