Vintage 18K white gold signet ring featuring an oval black onyx, adorned with a white diamond set "J" initial. The ring is sizable, offering a bright polish finish. 6 round brilliant cut diamonds: 0.06 ct. Color: G-H, Clarity: SI1-SI2Measurements:Front: 17.0 mm H x 13 mm W x 4.5 mm DBand: 4.5 mm WWeight: 6.5 gSize: 6.5 (sizable)Electronically tested for 18K gold.