Massive Congo Natural Malachite BoulderEst. £200-£300
BOULDER RIFLE AND PISTOL CLUBEst. €100-€200
Platinum Pendant Necklace with Boulder Opal and Diamond Accents Adjustable ChainEst. $2,964-$3,853
PT900 BOULDER OPAL RINGEst. $2,250-$3,300
18K White Gold Ladies Ring with 22.41ct Boulder Opal and 1.16ct tw Adjacent DiamondsEst. $13,250-$17,025
18K White Gold Ladies Ring with 22.41ct Boulder Opal and 1.16ct tw Adjacent DiamondsEst. $13,250-$17,025
Large Rose Quartz BoulderEst. £40-£60
PT900 BOULDER OPAL RINGEst. $1,950-$2,860
Platinum Cocktail Ring With Large Boulder Opal and Diamond AccentsEst. $4,394-$5,712
18k Yellow Gold Boulder Opal Diamond Pendant Necklace with Rope ChainEst. $3,809-$4,951
Sterling Silver Heart Pendant with Natural Boulder Opal NecklaceEst. $130-$169
Platinum Cocktail Ring With Large Boulder Opal and Diamond AccentsEst. $7,233-$8,137
John Sexton "Frost Covered Boulders, Yosemite" Photograph signedEst. $600-$900
18k Yellow Gold Boulder Opal Diamond Pendant Necklace with Rope ChainA Superb White Jade BoulderEst. $4,000-$8,000
Platinum Cocktail Ring with Colorful Boulder Opal and Diamond AccentsAmije Boulder Opal 6.4ct Diamond 0.22ct Platinum 900 Cocktail Ring Box PaperEst. $3,725-$4,475
Vintage Platinum 1.43ct GIA Oval Boulder Opal Ring with Diamond AccentsPlatinum Pendant Necklace with Boulder Opal and Diamond Accents Adjustable ChainPlatinum Cocktail Ring With Large Boulder Opal and Diamond AccentsDESIGNER 18K YELLOW GOLD AUSTRALIAN FIRE BOULDER OPAL ENHANCER PENDANT 1.5" -7GEst. $2,541-$2,840
ANTIQUE ETRUSCAN 14K YELLOW GOLD AUSTRALIAN FIRE BOULDER OPAL DANGLE EARRINGSEst. $1,181-$1,320
Platinum Cocktail Ring with Colorful Boulder Opal and Diamond Accents14K GOLD RING WITH NATURAL BOULDER OPAL, 0.03CTS OF DIAMOND ( SIZE: 8.25 ) 6GEst. $2,549-$2,849
![Massive Congo Natural Malachite Boulder: Cut section of a boulder showing botryoidal masses. 6.36 kg, 25.5 cm (10 in.). [No Reserve] From the Democratic Republic of Congo, Central Africa. Ex Mineral Imports, London, UK. Gregory, Bottley & Ll](https://p1.liveauctioneers.com/1191/415806/231335501_1_x.jpg?height=280&quality=70&sharpen=true&version=1777479005&width=280)
![Large Rose Quartz Boulder: Vibrant pink boulder of microcrystalline rose quartz. 4.13 kg, 18 cm (7 in.). [No Reserve] Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK. TimeLine Auctions follows](https://p1.liveauctioneers.com/1191/415806/231335297_1_x.jpg?height=280&quality=70&sharpen=true&version=1777479005&width=280)
