Here is a lovely Art Deco onyx and diamond ring. It has nicely etched white gold border around the yellow gold bezel around the onyx. The shoulders, also etched in white gold, complement the etched white gold frame around the onyx. The center is accented by an illusion set diamond in 10k white gold.

Gemstone: Marquise Black Onyx
Measurements: 16 x 8 mm

Gemstone: Natural Diamond
Cut: Single Cut Diamond
Color: H/I
Clarity: SI1/2
Weight: 1 = 0.03 cts
Measurements: 1.2 mm

Width: 20.9 x 13 mm / 3.4 - 1.4 mm wide shank / 2.6 mm high off finger
Metal: 10k yellow and white gold
Markings: A&S 10K
Finger Size: 6
Weight: 2 grams
Circa: 1920-30
Condition Rating: 6 (has recently had the gold bezel built up around the onyx, onyx shows wear at corners and underside has a chip, original diamond was replaced due to damage, recently sized up from a 3.25 to a 6, ring has had a cleaning and light polish)