Enchanting Vintage 10k White Gold Natural Onyx Diamond Ring

This lovely natural black onyx and diamond ring was crafted from 10k white gold (stamped "10k"). It features a beautiful natural marquise shaped black onyx cabochon. The black onyx shows some wear. It is accented with one natural round diamond weighing ~.01ct. The diamond is I1 in clarity and I-J in color. The ring measures ~22mm lengthwise on top of finger. Ring size is 7.25. It weighs 4.2 grams.