For sale is this circa 1920's ring set with a large 9mm x 18mm faceted black onyx and a 0.10 point genuine European diamond. The ring is currently a size 5 (your jeweler can easily size this up several sizes if necessary) and weighs 4.4 grams. It is in excellent condition with no cracks or chips. Design on filigree is not worn, but the karat mark is partially missing. Ring has been carefully acid tested and is guaranteed to be 18k gold.