Vintage 18k Yellow Gold and Onyx Inlay Diamond Ring

Impressive vintage carved black onyx hardstone inlay ring in 18k yellow gold with visible gold rivets and a single bezel set round brilliant cut diamond.  ID#: RG987 Diamond: One (1) bezel set, round brilliant cut diamond measuring approximately 5.25mmm in diameter.  Estimated to weigh 0.50 ct.  Estimated clarity is VS1, G colour.  Onyx: Two (2) carved black onyx hardstone each measuring approximately 25.6mm x 20.5mm x 3.8mm Metal: 18k yellow gold  Size: 5 Band Thickness: 10.5mm  Weight: 14.05g Markings: 'BASSANI' '18K'