An opal and diamond cluster ring. The oval black opal

A BLACK OPAL AND DIAMOND CLUSTER RING LONDON 1975The oval cabochon black opal within a surround of brilliant cut diamonds, approximately 0.48 carats total, the 18 carat gold shank stamped with sponsor

A 14k yellow gold cluster ring, set with an oval cabochon black opal, backed doublet, surrounded by a row of small diamonds, marked 14k, size 5 1/2. L. of opal: 13.5mm

OPAL AND DIAMOND CLUSTER RING The oval opal cabochon, within a brilliant-cut diamond surround, ring size approx. M

OPAL AND DIAMOND CLUSTER RING The oval opal cabochon, in a double tiered, brilliant-cut diamond surround, one diamond deficient, several possible diamond simulants, ring size approx. K (sizing band)

An opal and diamond cluster ring. The oval opal cabochon, with brilliant-cut diamond scalloped surround and similarly-cut diamond line shoulders. Estimated total diamond weight 0.15ct. Ring size N. We

An opal and diamond cluster ring. The oval opal cabochon, with rose-cut diamond surround. Ring size L. Weight 3.7gms.

BOULDER OPAL AND DIAMOND CLUSTER RING The oval boulder opal within a radiating surround set with brilliant-cut diamonds, ring size approx. N

An 18ct gold opal and diamond cluster ring. The oval opal cabochon, within a single-cut diamond surround, to the tapered band. Estimated total diamond weight 0.35ct. Hallmarks for London, 1978. Ring s

An opal and diamond cluster ring. The oval-shape opal, within a vari-cut diamond surround and shoulders. Ring size N. Weight 7.7gms. Overall condition fair to good. Some surface scratches/ wear, disco

18ct gold hallmarked black opal & diamond cluster ring: Outstanding ring supplied by Boodles, ring size T, 24 small but high grade diamonds. Opal measures 16mm x 11mm.

BLACK OPAL AND DIAMOND RING Containing one oval cabochon black opal measuring approximately 23.00 x 15.00 x 6.45 mm and 34 transitional and single cut diamonds weighing approximately 0.65 carat total.

BLACK OPAL AND DIAMOND RING Containing one oval cabochon black opal measuring approximately 15.00 x 13.00 mm and 40 round brilliant cut diamonds weighing approximately 0.40 carat total. Mounted in yel

BLACK OPAL AND DIAMOND RING Containing one oval cabochon black opal measuring 10.85 x 9.00 mm and 12 round brilliant cut diamonds weighing approximately 1.20 carats total. Mounted in yellow gold. Ring

Art Deco Platinum, Opal & Diamond Ringcentered on a prong set, oval black opal (14.97 x 10.48 x 5.03 mm) with three single cut diamonds on either side weighing approximately .11 total carat (H-I color

An opal and diamond cluster ring claw-set with an oval opal cabochon, in a single border of ten round brilliant-cut diamonds, indistinctly marked(Ring size: Q/R)

An opal three-stone and diamond ring. The graduated oval black opal cabochon line, with old-cut diamond double spacers and stylised foliate shoulders. Estimated total diamond weight 0.10ct. Ring size

An opal and diamond cluster ring claw-set with an oval cabochon opal, in a border of old round-cut diamonds, unmarked(Ring size: U)

TREMONTI 14K YELLOW GOLD OVAL BLACK OPAL AND DIAMOND RING, OPAL WEIGHS APPROXIMATELY 2.86 CTS; DIAMONDS WEIGH APPROXIMATELY TWT 1.03 CT. RING SIZE 7; GROSS WEIGHT 9.2 GRAMS

An opal and diamond cluster ring claw-set with an oval cabochon opal in a border of round-cut diamonds, to a plain band, stamped 18ct(Ring size: K)

18KYG Black Opal and Diamond Ring size 11, bezel set oval cabochon black opal doublet approx. 13.0mm x 8.5mm, 10 prong set mixed sized round brilliant cut diamonds approx. .30cttw., stamped and tested

10 ct. Lightning Ridge opal and diamond dinner ring set in 14K white gold mounting. Oval black opal measuring 13 mm x 10 mm x approx. 3.7 mm and containing 12 round brilliant diamonds with a total wei

Two pair of opal earrings, together with an opal and diamond ring. The largest earring pair composed of 18K yellow gold set with oval black opals of approximately .70 carats each. Overall earring meas

Black Opal, Diamond, Platinum, Gold Ring The ring features an oval-shaped black opal caboc

Vintage, black opal triplet and diamond ring, 14K yellow gold, contains an oval black opal triplet and 26 single cut diamonds weighing approximately 0.75 carats total, G-H/VS-SI; 7.50 dwts, size: 7 1/