1 day LeftNative Copper Quartz Crystal Keweenaw MichiganEst. $50-$75$10(1 bid)Davis Brothers AuctionMissoula, MT
Aug 22, 2026A CHINESE CRYSTAL PHOENIX EWEREst. $3,000-$4,000$500EDEN Fine Antiques GalleriesMarietta, GA
Aug 26, 2026A MAGNIFICENT AMETHYST PLATE ON A PROFESSIONAL STANDEst. $1,200-$1,500$1,000J. Greenstein & Co., Inc.Cedarhurst, NY
Sep 12, 2026Large Mineral, Rock, and Geode CollectionEst. $300-$500$225(3 bids)Nadeau's Auction GalleryWindsor, CT
Aug 27, 2026Polished Banded Agate Geode Library Bookends PAIREst. $1-$1,000$1MiddleManBrokers Inc.Sunrise, FL
Aug 26, 202612 Carat Natural Pakistani Kashmir Purple Sapphire Cushion Cut EGL CertifiedEst. $54,000-$55,000$50California GemstonesOceanside, CA
Sep 12, 2026Mixed Fossil, Crystal and Mineral CollectionEst. £50-£70£5TimeLine Auctions Ltd.Harwich, Essex
4 days LeftTraugott Bromme – Mineralogical and Crystal Structure Study – Engraving (19th Century)Est. €200-€300€20Dahlstroms AuctioneerAvignon, Provence-Alpes-Cote d'Azur
Aug 24, 2026Amethyst Geode & Acicular Mineral SetEst. $10-$500$10(1 bid)Atlee Raber AuctionsDundee, OH
2 days Left2.11 Ct. Natural Black Loose Diamond Round Brilliant Cut Size 7 Mm.Est. $1,582-$2,486$1Treasure of Gems & JewelryLake Charles, LA
Oct 17, 2026Antique amethyst crystal carving in the shape of three tropical fish ca 1900-20Est. $500-$750$150Olde Trove Auction House IncLeesburg, FL
1 day LeftDecorative Star of David Gemstone and Crystal Display SculptureEst. $100-$10,000$4(2 bids)Donny Malone AuctionsSaugerties, NY
Aug 31, 2026Amethyst Quartz Geode Slice on Acrylic StandEst. $400-$2,000$200Blue Moon Estate Sales Of South Orange CountyLaguna Niguel, CA
1 day LeftGreen Tourmaline Rough Mineral Specimen, Natural Uncut CrystalEst. $5-$10,000$5Col. Christie Hatman AuctioneersThayer, MO
Aug 22, 2026Tray Of Geodes & Crystal Specimens - Amethyst, Quartz, CitrineEst. $200-$250$80George Cole AuctionsRed Hook, NY
Aug 29, 2026A CHINESE ROCK CRYSTAL BOAT ORNAMENTEst. $4,000-$5,000$800Gordon Fine Art Gallery LLCFanwood, NJ
1 day Left4.66ct Natural African Royal Blue Sapphire Parcel Loose Gemstones, 39BEEst. $10-$200$10ThousandPlanetSathorn, Bangkok
Aug 29, 2026Massive, Deep Purple Amethyst Crystal Cluster Geode SpecimenEst. CA$50-CA$50,000CA$80(3 bids)Kavanagh AuctionsMontreal, Quebec
Aug 26, 2026ALARGE AND MAGNIFICENT AMMONITE FOSSIL. POLISHEDEst. $120-$240$80(1 bid)J. Greenstein & Co., Inc.Cedarhurst, NY