A diamond plaque ring. The brilliant-cut diamond

AN EMERALD AND DIAMOND PLAQUE RING the geometric face set with an octagonal step cut emerald of 0.56 carats, accented by round brilliant cut diamonds all totalling 1.6-1.8 carats, no assay marks, size

DIAMOND PLAQUE RING Set with old brilliant-cut diamonds, diamonds approx. 0.50ct total, ring size approx. O For further information on this lot please visit Bonhams.com

A DIAMOND PLAQUE RING in platinum, the oval face set with a central cluster of round brilliant cut diamonds, the pierced body set with further round brilliant cut diamonds, the diamonds all totalling

DIAMOND PLAQUE RING Set with cushion and old brilliant-cut diamonds, diamonds approx. 0.80ct total, ring size approx. R

EMERALD AND DIAMOND PLAQUE RING Of geometric design, the oval-cut emerald within a surround of old brilliant and single-cut diamonds and calibré-cut emeralds, three emeralds deficient, ring size

SAPPHIRE AND DIAMOND RING Of plaque design set with cushion-shaped and oval-cut sapphires and old brilliant-cut diamonds, ring size approx. I1⁄2 For further information on this lot please visit

EMERALD AND DIAMOND RING Of openwork plaque design set with an oval-cut emerald and brilliant-cut diamonds, ring size approx. M½ For further information on this lot please visit Bonhams.com

AN ENAMEL AND DIAMOND DRESS RING The rectangular plaque, composed of blue enamel and accented by single and brilliant-cut diamonds, between split trifurcated shoulders, stamped 18CT, ring size N.Â

YELLOW GOLD, LAPIS LAZULI AND DIAMOND SNAKE RING Lapis lazuli plaque with applied snake and one round brilliant cut diamond. Yellow gold. Ring size 5. Gross weight: 8.10 dwt. This lot is loca

DIAMOND AND GEM-SET NECKLACE; DIAMOND AND ONYX RING; DIAMOND PENDANT NECKLACE 1st: The plaque set with vari-cut smoky quartz, citrine, rubies and brilliant-cut diamonds, 2nd: The ring obliquely-set wi

A SAPPHIRE AND DIAMOND DRESS RING The elongated openwork plaque, centred by a collet-set old brilliant-cut diamond, accented by similarly-cut diamonds and marquise-shaped sapphires, to a polished hoop

A diamond, onyx and 18k gold ring the 'spinner' ring centering a bezel-set round brilliant-cut diamond atop a round onyx plaque, the octagonal frame further set with 12 round brilliant-cut diamonds; 8

CARTIER: DIAMOND-SET 'BERLINGOT' RING Of plaque design, pavé-set with brilliant-cut diamonds, mounted in 18 carat white gold, diamonds approx. 2.85cts total, signed Cartier, maker's mark JC, Fren

YELLOW GOLD, ONYX AND DIAMOND RING Containing one oval onyx plaque measuring approximately 18.00 x 13.00 mm and 12 round brilliant cut diamonds. Ring size 7. Stamp: SJ14K. Gross weight: 6.30 dwt. Prop

YELLOW GOLD, ONYX AND DIAMOND RING Containing two curved onyx plaques and 13 round brilliant cut diamonds weighing approximately 0.80 carat total. Ring size 6 1/2. Stamp: (partially obscured) 18K. Gro

AN ONYX AND DIAMOND DRESS RING The onyx stripes alternating with rows of brilliant-cut diamonds, each side terminating in a similarly-set plaque with calibré-cut diamond highlights, mounted in 18

BULGARI: A DIAMOND AND ONYX 'DIVA'S DREAM' RING Each segment set with alternating onyx plaques or brilliant-cut diamonds, mounted in 18 carat white gold, diamonds approx. 1.10cts total, signed Bulgari

10K gold and diamond wide band and marquise shaped ring set with approx. 99 round brilliant cut diamonds, approx. .43 carat total weight, color I-M, clarity SI-I. Central marquise shaped plaque approx

JADE AND DIAMOND RING Containing one round carved jade plaque measuring approximately 16.30 mm in diameter and 26 round brilliant cut diamonds weighing approximately 0.45 carat total. Mounted in yello

LA TRIOMPHE, TIGER'S EYE AND DIAMOND RING Containing one oval tiger's-eye plaque and 26 round brilliant cut diamonds weighing approximately 0.50 carat total. Mounted in bicolor gold. Ring size 6. Stam

R. STONE, VINTAGE, DIAMOND AND MALACHITE RING Containing two ribbed carved malachite plaques and 26 round brilliant cut diamonds weighing approximately 0.95 carat total. Mounted in bicolor gold. Ring

A DIAMOND COCKTAIL RING, BY CARTIER The bombé square plaque, pavé-set throughout with brilliant-cut diamonds to a plain polished gold hoop, mounted in 18K gold, diamonds approximately 3.00ct

A Retro Platinum Topped Rose Gold and Diamond Ring, in a banded scrollwork design, the center surmounted with a platinum plaque containing three round brilliant cut diamonds and two old European cut d

Art Deco Black onyx, diamond, and gold ring Designed with a black onyx plaque, enhanced by a round brilliant-cut diamond; 1920s 10k yellow gold Ring size 10; Gross weight 10.9 dwts Thi