This is a K18 pendant top featuring a diamond-shaped black stone. I am selling it to organize my accessories. (*^^*) It's a very delicate pendant top. It has a K18 hallmark (see photo 4). Please refer to photos 5 and 6 for the size. The weight is 0.48g. The decimal point doesn't show up clearly in the photo, sorry. I believe the black stone is onyx, but I'm not certain. The chain in the photo is for reference only; this listing is for the pendant top only. Please understand this before purchasing. Free shipping, anonymous delivery, and will be delivered quickly and carefully. *Please refrain from canceling due to reasons such as "it's different from the image." Please be satisfied with the photos and description before purchasing. m(__)m K18 pendant top K18 Necklace Pendant Accessories