5.85ct Australian Boulder Opal and Diamond Pendant 18K Gold V1126
Located in Osprey, FL
This stunning 5.85ct Australian Boulder Opal and Diamond Pendant will captivate you with its rainbow play of color and vibrant, bright colors.
Diamond, Opal, 18k Gold, Yellow Gold
Natural 1.38ct Australian Black Boulder Opal 9k Yellow Gold Oval Signet Ring
By Gems and Jewels UK
Located in Birmingham, GB
Natural Australian Black Boulder Opal 9k Yellow Gold Signet Ring. A stunning 1.38 carat natural black opal with a beautiful blue and purple play of colour and an excellent oval cabo...
Opal, Black Opal, Gold, 9k Gold, Yellow Gold
Natural 3.53 Australian pink and green boulder opal mined by Sue Cooper
Located in BELCONNEN, ACT
This lovely 3.53 Ct Australian boulder opal was mined by Sue Cooper at her Yaraka opal mine in western Queensland, Australia in 2022.
Opal
14K Yellow Gold Emerald and 2.84ct tw Boulder Opal Drop Earrings
Located in Big Bend, WI
There are a pair of genuine earth mined boulder opals with white body color and blue-green play of color with some pink.
Emerald, Opal, Gold, 14k Gold, Yellow Gold
One-of-a-Kind 11.7 CTW Australian Boulder Opal Diamond Platinum Pendant Necklace
By Meghna Jewels
Located in Hoffman Estate, IL
Presented in an elegant freeform cushion shape, the opal possesses a fluid, painterly appearance that highlights the natural artistry prized in fine boulder opals.
Diamond, Opal, Platinum
Boulder Opal Cuff Bracelet Tourmaline Mexican Opal Zircon 22k 18k 14k Gold
By Jennifer Kalled
Located in Wolfeboro, NH
This exquisite cuff bracelet celebrates the artistry of boulder opals as its centerpiece, featuring three magnificent stones that showcase opal's complete spectrum of color and lumin...
Opal, Sapphire, Tourmaline, Fire Opal, Zircon, 14k Gold, 18k Gold, 22k Gold
Natural 9.42 Ct Australian light pastel boulder opal mined by Sue Cooper
Located in BELCONNEN, ACT
This lovely 9.42 Ct Australian boulder opal was mined by Sue Cooper at her Yaraka opal mine in western Queensland, Australia in 2022.
Opal
Boulder Opal Gold Ring Engagement fantasy style Elf Australian opal
By Alexey Gabilo
Located in Berlin, DE
An opal ring from timeless Magic forest collection: Unisex Boulder Opal in 14K yellow gold ring opal origin - Australia opal measurements - 0.16 х 0.31 х 0.47 in / 4 х 8 х 12 mm sto...
Opal, 14k Gold, Yellow Gold, Gold
Rainbow Boulder Opal Ring in Solid Sterling Silver 5 ct 6.5 gift anniversary
Located in Berlin, DE
This 925 sterling silver and 18K gold ring features a vivid Australian Boulder Opal showing a full spectrum of rainbow colors - a lively display of green, blue, gold, red, and violet...
Opal, Gold Plate, Silver, 18k Gold, Sterling Silver
Great 14K Gold Boulder Opal Engagement Ring with Diamonds
Located in Suwanee, GA
14K Gold Boulder Opal Engagement Ring with Diamonds. Free Domestic USPS First Class Shipping!
Diamond, Opal, Gold, 14k Gold, Yellow Gold
$5,437Sale Price|25% Off
Syna Cosmic Star Studs with Boulder Opal and Diamonds
By Syna Jewels
Located in Fort Lee, NJ
Created in 18 karat yellow gold Boulder Opal 4.50 carats approx. Diamonds 0.20 carat approx.
Diamond, Opal, 18k Gold, Yellow Gold
Flowers Design Boulder Opal Engagement Ring 14K Yellow Gold
Located in Suwanee, GA
Flowers Design Boulder Opal Engagement Ring 14K Yellow Gold. Free Domestic USPS First Class Shipping!
Opal, Gold, 14k Gold, Yellow Gold
18k Yellow Gold Freeform Boulder Opal & Diamond Pendant w/ Rope Chain Necklace
Located in Montclair, NJ
–Stone(s)– (1) Natural Genuine Boulder Opal - Free Form Shape - Bezel Set - Blue Base w/ Nice Play of Color - 17.66 x 8.63mm (approx.) - 5.02ctw (exact) (2) Natural Genuine Diamonds ...
Diamond, Opal, Gold, 18k Gold, Yellow Gold
Pear Shaped Boulder Opal Stud Earrings 14K Yellow Gold
Located in Suwanee, GA
Pear Shaped Australian Boulder Opal Stud Earrings 14K Yellow Gold. Free Domestic USPS First Class Shipping!
Opal, Gold, 14k Gold, Yellow Gold
14k Yellow Gold Oval Bezel Fiery Boulder Opal w/ Diamond Band Ring
Located in Montclair, NJ
--Stone(s):-- (1) Natural Genuine Boulder Opal - Oval Cabochon Cut - Bezel Set - Gray Color w/ Nice Play of Orange & Red (3) Natural Genuine Diamonds - Round Brilliant Cut - Channel...
Diamond, Opal, Gold, 14k Gold, Yellow Gold
Artcanvas Boulder Opal & Diamond Engagement Ring in 18K Gold
Located in Suwanee, GA
Artcanvas Boulder Opal & Diamond Engagement Ring in 18K Gold.
Diamond, Opal, Gold, Yellow Gold, 18k Gold
Australian Boulder Opal Feather Style Pendant 18K Gold 11.3g V1124
Located in Osprey, FL
This exquisite Australian Boulder Opal pendant features a stunning feather-like design in a matte texture, crafted in beautiful solid 18K gold.
Opal, 18k Gold, Yellow Gold
Australian Boulder Opal Necklace Sterling Silver Pendant 15.7ct gift
Located in Berlin, DE
Elegant 925 solid sterling silver pendant featuring a stunning natural Boulder Opal weighing 15.7 ct. This Australian opal displays unique patterns and colors, making it a one-of-a-k...
Opal, Sterling Silver
Meira T Boulder Opal & Diamond Drop Earrings 925 Sterling Silver 14K white Gold
By Meira T
Located in New York, NY
These earrings are made in 925 sterling silver with a center oval shape boulder opal with diamond studded halo setting. These earrings come with diamond accented hook post made in 14...
Diamond, Opal, White Gold, Sterling Silver
Boulder Opal & Paraiba Tourmaline Diamond 18k Yellow Gold “Fish in Coral” Brooch
Located in Beverly Hills, CA
A modern and elegant brooch featuring a lovely Australian boulder opal as its centerpiece, radiating vivid blue and green colors.
Diamond, Opal, Paraiba, Tourmaline, 18k Gold, Yellow Gold
Blue Boulder Opal Silver Ring large 8.75 size gift opal anniversary wedding
Located in Berlin, DE
An unisex ring showcasing a natural Australian boulder opal of impressive scale, measuring 0.55 × 0.75 in (14 × 19 mm).
Opal, Silver
Vintage 18k Yellow Gold Bezel Matrix Boulder Opal Pendant on 15.5" Bar Necklace
Located in Montclair, NJ
--Stone(s):-- (1) Natural Genuine Matrix Boulder Opal - Freeform Shape - Bezel Set - Natural Variation of Brown Base Color w/ Gorgeous Flashes of Blue, Green, and Orange - 31.7x16.3m...
Opal, Yellow Gold
The Egret - Australian Boulder Opal Diamond Sapphire Pendant & Brooch 18k
Located in Suwanee, GA
The Egret - Australian Boulder Opal Diamond Sapphire Pendant & Brooch 18k White & Yellow Gold.
Diamond, Opal, Sapphire, 18k Gold, White Gold, Yellow Gold, Gold
Boulder Opal Ring 22 Karat 18k Gold Pyramid Stone Blue Green Jennifer Kalled
By Jennifer Kalled
Located in Wolfeboro, NH
Art jewelry is as unique as its collectors. This boulder opal not only has the blue, green & red flashes that everyone loves, but it has a unique quality of a pyramid stone.
Opal, 14k Gold, 18k Gold, 22k Gold
One-of-a-Kind 7.59 CTW Australian Boulder Opal Diamond Platinum Pendant Necklace
By Meghna Jewels
Located in Hoffman Estate, IL
Presented in an elegant freeform triangular shape, the opal possesses a fluid, painterly character that highlights the organic beauty prized in fine boulder opals.
Diamond, Opal, Emerald, Ruby, Blue Sapphire, Platinum
Art Nouveau 7 Carat Boulder Opal 14k Filigree Dinner Ring
Located in Santa Barbara, CA
A lovely Art Nouveau 7 carat boulder opal dinner ring straight from a great estate collection of noted Santa Barbara antique dealer Robert Livernois.
Opal, Gold, 14k Gold, Yellow Gold
Platinum 2.29ctw Oval Bezel Boulder Opal w/ Diamond Cluster Accents Modern Ring
Located in Montclair, NJ
--Stone(s):-- (1) Natural Genuine Boulder Opal - Oval Cut - Bezel Set - Black Color w/ Green, Orange & Blue Play of Color - 10.8x7mm - 2.17ct (exact) (6) Natural Genuine Diamonds - R...
Diamond, Opal, Platinum
Australian Boulder Opal Modernist Design Statement Ring 18K Gold 14.2g V1112
Located in Osprey, FL
Behold this exquisite statement ring, crafted with a unique Australian boulder opal, set in a modernist organic floral head of solid 18K gold.
Opal, Diamond, Tourmaline, Tsavorite, 18k Gold
Antique c. 1900 CARTIER Henri Picq 18k Solid Gold & 4ct Boulder Opal Stick Pin
By Cartier
Located in Beverly Hills, CA
Antique c. 1900 Cartier & Henri Picq 18k Solid Gold & 4ct Boulder Opal Stick Pin Henri Picq for Cartier pieces don't show up very often.
Opal, Gold
Boulder Opal Pendant Colorful Blue Natural Australian Gemstone Unisex gift
Located in Berlin, DE
Silver pendant with natural Boulder Opal gemstone origin - Australia gem size is 0.16 x 0,51 x 0,94 in / 4 x 13 x 24 mm stone weight - 14 carats pendant length - 1,22 in / 34 mm pen...
Opal, Silver
Boulder Opal Halo Diamond Engagement Ring 14K Yellow Gold
Located in Suwanee, GA
Boulder Opal Halo Diamond Engagement Ring 14K Yellow Gold.
Diamond, Opal, Gold, Yellow Gold, 14k Gold
Boulder Opal Silver Pendant gift Multicolor Natural Australian Stone necklace
Located in Berlin, DE
Silver pendant with natural Boulder Opal opal origin - Australia opal measurements - 0.2 х 0.51 х 1.06 in / 5 х 13 х 27 mm opal weight - 19.45 carats pendant weight - 6.54 grams pen...
Opal, Silver, Sterling Silver
Natural 7.66 Ct Australian green and pink boulder opal mined by Sue Cooper
Located in BELCONNEN, ACT
This beautiful 7.66 Ct Australian boulder opal was mined by Sue Cooper at her Mt. Margaret opal mine in western Queensland, Australia in 2024.
Opal
Boulder Opal Necklace Australian Gemstone Ivy Art Nouveau style gift
By Alexey Gabilo
Located in Berlin, DE
Ivy pendant with natural Boulder Opal in patinated silver on 100% silk black cord (handmade in Japan) opal origin - Australia opal weight - 122 carats pendant weight - 58 grams pend...
Opal, Silver, Sterling Silver
7.74 Carat Natural Australian Boulder Opal Pendant/Brooch Made in Platinum
Located in Tokyo, JP
A beautiful pendant top featuring a 7.74 Carat Australian Boulder Opal and 0.48 Carat Diamonds made in Platinum.
Diamond, Opal, Platinum
Boulder Opal Silver Pendant Terracotta Red Natural Australian Opal Unisex gift
Located in Berlin, DE
Natural boulder opal silver pendant opal origin - Australia opals measurements - 0.16 х 0.71 х 1.22 in / 4 х 18 х 31 mm opals weight - 17.15 carats pendant length - 1.65 in / 42 mm ...
Opal, Silver, Sterling Silver
Boulder Opal Ring Gold Gem Unisex Jewelry Unique engagement ring
By Alexey Gabilo
Located in Berlin, DE
14K yellow gold ring with unique Boulder Opal Opal origin - Australia Opal measurements - 0,24 х 0.0,43 х 0,79 in / 6 х 11 х 20 mm stone weight - 12.70 carats ring weight - 6.89 gra...
Opal, Yellow Gold, 14k Gold, Gold
Opal Ring Gold Unisex Jewelry Vrubel Demon Engagement ring Boulder opal
By Alexey Gabilo
Located in Berlin, DE
Vrubel collection - Boulder Opal ring in 14K yellow gold opal origin - Australia opal measurements - 0,24 х 0.0,43 х 0,79 in / 6 х 11 х 20 mm stone weight - 12.70 carats ring weight...
Opal, Gold, 14k Gold, Yellow Gold
Beautiful Triangle Shaped Boulder Opal Pendant Necklace 14K Yellow Gold
Located in Suwanee, GA
Triangle Shaped Boulder Opal Pendant Necklace 14K Yellow Gold. Free Domestic USPS First Class Shipping!
Opal, Gold, 14k Gold, Yellow Gold
Two Colored Australian Boulder Opal Pendant Necklace 14K Yellow Gold
Located in Suwanee, GA
Two Colored Australian Boulder Opal Pendant Necklace 14K Yellow Gold. Free Domestic USPS First Class Shipping!
Opal, Gold, 14k Gold, Yellow Gold
Three Stone Boulder Opal Diamond Engagement Ring 14K Yellow Gold
Located in Suwanee, GA
Three Stone Boulder Opal Diamond Engagement Ring 14K Yellow Gold.
Opal, Diamond, Gold, 14k Gold, Yellow Gold
$8,400Sale Price|42% Off
Syna Yellow Gold Hex Earrings with Boulder Opal and Diamonds
By Syna Jewels
Located in Fort Lee, NJ
Created in 18 karat yellow gold Boulder Opal 9.70 carats approx. Diamonds 0.60 carat approx.
Diamond, Opal, 18k Gold, Yellow Gold
Halo Diamond Australian Boulder Opal Stud Earrings 14k Yellow Gold
Located in Suwanee, GA
Halo Diamond Australian Boulder Opal Stud Earrings 14k Yellow Gold. Free Domestic USPS First Class Shipping!
Diamond, Opal, Yellow Gold, Gold, 14k Gold
77.80 Carat Natural Australian Boulder Opal and Diamond Pendant Made in Platinum
Located in Tokyo, JP
A beautiful pendant featuring a 77.80 Carat Australian Boulder Opal and 0.82 Carat Diamonds made in Platinum.
Diamond, Opal, Black Opal, Platinum
Natural 2.75 Ct Australian green and pink black boulder opal mined by Sue Cooper
Located in BELCONNEN, ACT
This beautiful 2.75 Ct Australian boulder opal was mined by Sue Cooper at her Yaraka opal mine in western Queensland, Australia in 2024.
Opal, Black Opal
Elegant Triangle Shaped Boulder Opal Pendant Necklace 14K Yellow Gold
Located in Suwanee, GA
Triangle Shaped Boulder Opal Pendant Necklace 14K Yellow Gold. Free Domestic USPS First Class Shipping!
Opal, Gold, 14k Gold, Yellow Gold
"Maxine" Boulder Opal Pendant Necklace in 18 Karat Gold with Diamond Accents
By Eytan Brandes
Located in Sherman Oaks, CA
This one-of-a-kind showstopper by Eytan Brandes features two gorgeous and lively Australian boulder opals framed in gold and accented with natural brown diamonds.
Diamond, Brown Diamond, Opal, Gold, 18k Gold, Yellow Gold
Unusual Boulder Opal Silver 18k Gold necklace anniversary gift for men birthday
Located in Berlin, DE
Silver necklace with natural unusual Boulder Opal in a shield shape (18K gold plated) gemstone origin - Australia gem size is 0.47 x 1.10 in / 12 x 28 mm stone weight - 20.20 ct pend...
Opal, 18k Gold, Gold Plate, Silver
Large Boulder Opal Ring silver Green Blue Australian Gemstone unisex vintage
Located in Berlin, DE
Large matte finish silver ring with natural Boulder Opal opal origin - Australia opal weight - 10.6 carats ring weight - 8.05 grams ring size - 8 1/4 US opal measurements - 0.2 х 0....
Opal, Silver
Large Boulder Opal SIlver Ring Colorful Gemstone Statement ring gift 8 ct
Located in Berlin, DE
Indulge in the exquisite beauty of this singular piece – a sterling silver ring, meticulously crafted with a matte finish and showcasing an 8.45-carat oval cabochon Australian Boulde...
Opal, Silver
72.25 Carat Australian Boulder Opal Platinum & 18k Y Gold Ship-at-Sea Brooch
Located in Beverly Hills, CA
Picture a majestic brooch, a symphony of iridescence and elegance, crowned by a mesmerizing 72.25 carat boulder opal at its heart! This opal, like a miniature landscape of a ship at ...
Diamond, Opal, 18k Gold, Yellow Gold, Platinum
Boulder Opal Gold Pendant Walnut Brown Triangle gift natural opal necklace gold
Located in Berlin, DE
18K gold pendant with natural Boulder Opal opal origin - Australia opal measurements - 0.16 х 0.67 х 0.79 in / 4 х 17 х 20 mm stone weight - 9.85 carats pendant length - 1.1 in / ...
Opal, Gold, 18k Gold, Yellow Gold
4.96 Carat Natural Australian Boulder Opal and Diamond Pendant Made in Platinum
Located in Tokyo, JP
A beautiful pendant featuring a 4.96 Carat, Natural, Australian Boulder Opal and 0.12 Carats of Diamond Accents set in Platinum.
Diamond, Opal, Black Opal, Platinum
$5,200Sale Price|20% Off
Boulder Opal Diamond Yellow Gold One-of-a-Kind Necklace, Just Jules 2025
By Julie Romanenko
Located in Dallas, TX
Celebrate the raw elegance of nature with this stunning Boulder Opal and Diamond Necklace from jewelry designer Just Jules.
Diamond, Multi-gemstone, Opal, Gold, 14k Gold, Yellow Gold
Beautiful Natural Boulder Opal Ring with Diamonds in 14K Yellow Gold
Located in Suwanee, GA
Natural Boulder Opal Ring with Diamonds in 14K Yellow Gold.
Opal, Diamond, Yellow Gold, 14k Gold, Gold
11.69 Carat Natural Australian Boulder Opal and Diamond Ring Made in Platinum
Located in Tokyo, JP
A beautiful ring featuring a 11.96 Carat, Natural, Australian Boulder Opal and 0.46 Carats of Diamond Accents set in Platinum.
Diamond, Opal, Black Opal, Platinum
Syna Limited Edition Yellow Gold Boulder Opal and Diamonds Hex Necklace
By Syna Jewels
Located in Fort Lee, NJ
Created in 18 karat yellow gold Boulder Opal 15.20 carats approx. Diamonds 4 carats approx. 18 inch length 18 karat yellow gold lobster clasp Limited edition About the Designers ~...
Diamond, Opal, 18k Gold, Yellow Gold
Gold is the feel-good metal, the serotonin of jewelry. Wear vintage and antique gold necklaces, watches, gold bracelets or gold rings and you feel happy, you feel dressed, you feel, well, yourself.
Gold, especially yellow gold, with its rich patina and ancient pedigree going back thousands of years, is the steady standby, the well-mannered metal of choice. Any discussion of this lustrous metal comes down to a basic truth: Gold is elementary, my dear. Gold jewelry that couples the mystique of the metal with superb design and craftsmanship achieves the status of an enduring classic. Many luxury houses have given us some of our most treasured and lasting examples of gold jewelry over the years.
Since its founding, in 1837, Tiffany & Co. has built its reputation on its company jewelry as well as its coterie of boutique designers, which has included Jean Schlumberger, Donald Claflin, Angela Cummings and Elsa Peretti. There are numerous gold Tiffany classics worth citing. Some are accented with gemstones, but all stand out for their design and the workmanship displayed.
For the woman who prefers a minimalist look, the Tiffany & Co. twist bangle (thin, slightly ovoid) is stylishly simple. For Cummings devotees, signature pieces feature hard stone inlay, such as her pairs of gold ear clips inlaid with black jade (a play on the classic Chanel black and tan), or bangles whose design recalls ocean waves, with undulating lines of lapis lazuli and mother-of-pearl. And just about any design by the great Jean Schlumberger is by definition a classic.
Even had he eschewed stones and diamonds, Southern-born David Webb would be hailed for the vast arsenal of heavy gold jewelry he designed. Gold, usually hammered or textured in some manner, defines great David Webb jewelry. The self-taught jeweler made very au courant pieces while drawing inspiration from ancient and out-of-the-way sources — East meets West in the commanding gold necklaces made by Webb in the early 1970s. The same could be said for his endlessly varied gold cuffs.
In Europe, many houses have given us gold jewelry that sets the highest standard for excellence, pieces that were highly sought after when they were made and continue to be so.
Numerous designs from Cartier are homages to gold. There are the classic Trinity rings, necklaces and bracelets — trifectas of yellow, white and rose gold. As a testament to the power of love, consider the endurance of the Cartier Love bracelet.
Aldo Cipullo, Cartier’s top in-house designer from the late 1960s into the early ’70s, made history in 1969 with the Love bracelet. Cipullo frequently said that the Love bracelet was born of a sleepless night contemplating a love affair gone wrong and his realization that “the only remnants he possessed of the romance were memories.” He distilled the urge to keep a loved one close into a slim 18-karat gold bangle.
BVLGARI and its coin jewelry, gemme nummarie, hit the jackpot when the line launched in the 1960s. The line has been perennially popular. BVLGARI coin jewelry features ancient Greek and Roman coins embedded in striking gold mounts, usually hung on thick link necklaces of varying lengths. In the 1970s, BVLGARI introduced the Tubogas line, most often made in yellow gold. The Tubogas watches are classics, and then there is the Serpenti, the house's outstanding snake-themed watches and bracelets.
A collection called Monete that incorporated the gold coins is one of several iconic BVLGARI lines that debuted in the 1970s and ’80s, catering to a new generation of empowered women. Just as designers like Halston and Yves Saint Laurent were popularizing fuss-free ready-to-wear fashion for women on the go, BVLGARI offered jewels to be lived in.
Since Van Cleef & Arpels opened its Place Vendôme doors in 1906, collection after collection of jewelry classics have enchanted the public. As predominantly expressed in a honeycomb of gold, there is the Ludo watch and accessories, circa the 1920s, and the golden Zip necklace, 1951, whose ingenious transformation of the traditional zipper was originally proposed by the Duchess of Windsor. Van Cleef's Alhambra, with its Moroccan motif, was introduced in 1968 and from the start its popularity pivoted on royalty and celebrity status. It remains one of VCA’s most popular and collected styles.
Mention must be made of Buccellati, whose name is synonymous with gold so finely spun that it suggests tapestry. The house’s many gold bracelets, typically embellished with a few or many diamonds, signified taste and distinction and are always in favor on the secondary market. Other important mid-20th-century houses known for their gold-themed jewelry include Hermès and Ilias Lalaounis.
Find a stunning collection of vintage and antique gold jewelry on 1stDibs.
Opals were discovered in 400 BC, and since then five types have been found throughout the world. Before you start shopping for mysteriously beautiful vintage opal rings and other opal jewelry, learn about the different varieties of the gem — and find out which historical figure was reportedly willing to trade his kingdom for a single stone.
Here is a little riddle for you: the month of October has two birthstones, but only one of them encompasses the colors of other birthstones. If you guessed opal, you’re right! (The other gemstone associated with the month of October is tourmaline.)
Opals are such unusual gemstones that there are too many old-wives tales associated with them, like if you’re a blond, wearing an opal necklace will protect your locks from losing color. Opals were also very fashionable in the early 19th century, up until the publication of Sir Walter Scott’s novel Anne of Geierstein in 1829. The title heroine wears an opal and succumbs to an untimely death. However, the British monarchy, and in particular Queen Victoria, did not let this story get in their way, and they frequently gifted opals to friends and family members. October babies should disregard the noise and proudly wear their opals!
There are five types of precious opals: boulder opal, fire opal, crystal/water opal, black opal, and white/light opal. Each variety is distinguished by its color.
So, where does the name come from? The word opal is thought to originate from the Roman opalus or from the Sanskrit úpala (“precious stone”) or from the Greek opallios (“to see a color change”). So while there have been many names for the stones, opals were first discovered in 400 BC in Ethiopia. But the early reference that comes up most often in history books is from the Roman philosopher Pliny the Elder, who wrote about it in 75 AD. In his text he refers to it as opali. The Romans were big fans of opal, Mark Antony was so enamored by it that, as the story goes, he was willing to trade a portion of his kingdom for a single opal.
There's a wide variety of antique and vintage opal jewelry on 1stDibs (and you won't have to trade your kingdom for it).