Stone Type _________________ Created Black Opal Approximate Stone Size _______ 8x6mm Approximate Stone Weight _____ 3 ct Jewelry Metal _______________ Solid .925 Sterling Silver Our Warranty _______________ A full year on workmanship Our Guarantee _____________ Totally unconditional 30 day guarantee ______________________________________________________________________ A comfortable 8x6mm , these are pretty stones. All sorts of red, blue and green flash on a black background. If these were mined stones, they'd cost $1,000/ct, but they're not and so you and I can both afford it. This looks just like your best Lightning Ridge Opal, but it's not. Oh, and it's a LOT more durable too. Nothing gives you a bad day worse than your $1,000/ct natural black opal getting cracked up the middle just 'cause you wore it on a cold day. That won't happen with this material. Very durable, and if there's a problem, very inexpensive. Good for the office, for the evening, or just because. These stones are set into cinchmounts hanging from Threaders -- essentially a variation on a bezel mounting. It allows the most show of stone for the least expense in silver. It's a good stable setting that doesn't set you back a month just to get one. ______________________________________________________________________ BTW, Since we make this from scratch after you order it, we have a lot of flexibility. We can also make this for you in either 14k yellow gold or 14k white gold. Email us and let us know what you're interested in, and we'll give you the best price we can live with. We enjoy a strong repeat business, and keep it by making good jewelry you'll want to wear at prices that we both can live with.