Results for “opal 18k”

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(2) Extremely Rare Opal 18k Gold Rings: Both of these opals came from Spain about 50 years ago and they were both made in Spain about 50 years ago. They were both tested as 18k gold. As you can see by the reverse pictures, they were made by

2 days Left

(2) Extremely Rare Opal 18k Gold Rings

Est. $6,000-$8,000

$230

Coins and Auctions Since 1994Vancouver, WA

David Webb Newport Earrings Platinum 18K Gold Opal Rock Crystal: David Webb Newport Earrings Platinum 18K Gold Opal Rock Crystal Elevate your elegance with these stunning David Webb Newport Earrings, a true testament to luxury and craftsmanship. These exquisite ear

20 hrs Left

David Webb Newport Earrings Platinum 18K Gold Opal Rock Crystal

Est. $49,699-$64,608

$100

BidhausNew York, NY

Brooke Gregson 18K Gold Athena Engraved Boulder Opal Emerald Cuff Bracelet: Brooke Gregson hand-engraved 18K gold cuff bracelet featuring Georgian bezel-set boulder opal and emerald insets. Designer signed. Bracelet size 6 inches with 5 inches interior cuff measurement. Impre

May 24, 2026

Brooke Gregson 18K Gold Athena Engraved Boulder Opal Emerald Cuff Bracelet

Est. $4,000-$5,000

$2,000

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal And Diamond Cuff Bracelet: Brooke Gregson hand-engraved 18K gold cuff bracelet featuring boulder opal and diamond pavé. Designer signed. Bracelet size 6 inches with 5.5 inches interior of cuff. Total weight: 19.1 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal And Diamond Cuff Bracelet

Est. $2,500-$3,000

$1,200

Hughes AuctionsSunland, CA

A synthetic opal and 18k gold pendant: A synthetic opal and 18k gold pendant Set with an oval-shaped synthetic opal cabochon measuring 26.39 x 17.01 x 7.40 grams; length: 1 3/8 in; 5.60 grams

4 days Left

A synthetic opal and 18k gold pendant

Est. $200-$400

$100

Clars AuctionsOakland, CA

DIOR: A PAIR OF 18K GOLD, BLACK OPAL AND DIAMOND EARRINGS: DIOR: A PAIR OF 18K GOLD, BLACK OPAL AND DIAMOND EARRINGS Each comprising heart-shaped black opals, in surrounds of round brilliant-cut diamonds; signed Dior; with maker's marks; with French assay mar

May 19, 2026

DIOR: A PAIR OF 18K GOLD, BLACK OPAL AND DIAMOND EARRINGS

Est. $2,500-$3,500

$2,400

BonhamsLos Angeles, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. Pendant measures 1 3/4 inches wide. Necklace is 19 inches long. Total weight: 18 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $2,000-$3,000

$1,000

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: 19 inches long. Pendant 1 1/4 inches long. 18K gold necklace featuring a boulder opal pendant with blue and green hues. 18.1 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,500-$2,500

$750

Hughes AuctionsSunland, CA

Brooke Gregson Sterling & 18K Gold Boulder Opal Cuff: Brooke Gregson cuff bracelet featuring a sterling silver band with textured lines and an 18K gold bezel set boulder opal. Measures 4 3/4 inches wide with a 6 inch circumference. Weighs 57.4 grams.

May 24, 2026

Brooke Gregson Sterling & 18K Gold Boulder Opal Cuff

Est. $800-$1,200

$400

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. Chain is 16 inches, pendant is 1 inch wide, and the piece weighs 9.8 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,500-$2,500

$750

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. Chain is 18 inches, pendant is 5/8 inches wide. Total weight: 7.9 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. Chain is 16 inches, pendant is 1 1/4 inches wide, and the necklace weighs 10.5 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold & Boulder Opal Bracelet: Brooke Gregson 18K yellow gold bracelet featuring a striking boulder opal. Bracelet is 6 inches long, opal measures 1 1/8 inch. Total weight: 6.5 grams.

May 24, 2026

Brooke Gregson 18K Gold & Boulder Opal Bracelet

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Annette Ferdinandsen 18K Gold & Opal Pendant Necklace: Annette Ferdinandsen 18K gold necklace featuring a rectangular opal pendant. Chain is 19 inches, pendant is 1.25 inches. Total weight: 11.9 grams.

May 24, 2026

Annette Ferdinandsen 18K Gold & Opal Pendant Necklace

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. Pendant measures 1 1/4 inches wide. Necklace is 19 inches long. Total weight: 11.8 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,500-$2,500

$750

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Double Triangle Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal double triangle pendant. 16 inch chain. Pendant is 1 inch wide. 9.1 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Double Triangle Pendant Necklace

Est. $1,500-$2,500

$750

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. Chain is 17 inches long, pendant is 1 1/8 inches wide, and the piece weighs 6.9 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson necklace featuring an 18K gold chain and a boulder opal pendant. Chain is 18 inches long, pendant is 1 inch long. Weighs 14.4 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,500-$2,500

$750

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a triangular boulder opal pendant. Chain is 17 inches, pendant is 3/4 inch long. Total weight: 9.2 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal & Diamond Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant, a diamond-set bead, and a square opal accent. Chain is 18 inches, pendant is 1 inch long. Total weight: 11 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal & Diamond Necklace

Est. $1,500-$2,500

$750

Hughes AuctionsSunland, CA

Brooke Gregson Opal, Sterling & 18K Gold Cuff Bracelet: Brooke Gregson cuff bracelet featuring a boulder opal in an 18K gold bezel, set on a sterling silver band with etched design. 5 inch cuff, 6 inch bracelet. 20.6 grams.

May 24, 2026

Brooke Gregson Opal, Sterling & 18K Gold Cuff Bracelet

Est. $800-$1,200

$400

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace: Brooke Gregson 18K yellow gold necklace featuring a boulder opal pendant. The chain is 17 inches long, and the pendant measures 5/8 inch. Total weight: 7.2 grams.

May 24, 2026

Brooke Gregson 18K Gold Boulder Opal Pendant Necklace

Est. $1,200-$1,800

$600

Hughes AuctionsSunland, CA

Brooke Gregson 18K Gold Three Opal Silk Cord Bracelet: Brooke Gregson bracelet featuring three oval opal cabochons set in 18K gold bezels, connected by woven silk cord and gold chain. Marked 18K. Designer signed. Measures 6.5 inches in length. Weighs 6 gr

May 24, 2026

Brooke Gregson 18K Gold Three Opal Silk Cord Bracelet

Est. $400-$500

$200

Hughes AuctionsSunland, CA

18K Gold Boulder Opal Pendant Necklace: 18K yellow gold necklace featuring a boulder opal pendant. Hallmarked AM. Chain is 16 inches, pendant is 1 5/8 inches wide. Weighs 9.2 grams.

May 24, 2026

18K Gold Boulder Opal Pendant Necklace

Est. $800-$1,200

$400

Hughes AuctionsSunland, CA

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