From museum-worthy meteorites to vivid gemstones and collectible fossils, Rock & Gem is teaming up with Catawiki to present a curated online auction that celebrates the beauty and diversity of Earth—and beyond.
“Rock & Gem & Catawiki: The Mineral Collection” runs April 3–12, offering collectors, enthusiasts and first-time bidders a chance to acquire exceptional specimens sourced from around the globe.
A Curated Marketplace for Rock Collectors
Founded in 2008, Catawiki has grown into Europe’s most-visited curated marketplace for special objects, hosting more than 600 weekly auctions across categories ranging from fine art to classic cars. With over 75,000 items offered each week, the platform focuses on rare and hard-to-find pieces—making it a natural fit for the Rock & Gem audience.
This collaboration brings together expert curation and a passion for natural history, resulting in an auction lineup that spans minerals, gemstones, fossils and even extraterrestrial material.
Highlights from the Collection
This sale features a diverse mix of specimens, each with its own story of formation and discovery.
Collectors of fine jewelry will appreciate a large, ALGT-certified jadeite bangle from Myanmar, prized for its vivid natural color and substantial weight. From the famed Mogok region, a spinel crystal on matrix showcases the classic locality known for producing some of the world’s finest gems.
Mogok Tal, Mogok, Pyin-Oo-Lwin, Mandalay, Myanmar (Burma), Myanmar
Brazil is well represented with a HAPAX spessartine gemstone, noted for its striking ruby-red hue and architectural crystal growth, alongside a dramatic matched pair amethyst geode from Ametista do Sul—an iconic source of deep purple quartz formations.
Minas Gerais, Brazil
Ametista do Sul, Brazil
Gold enthusiasts will find a standout in the crystallized gold nugget dubbed “The Meteor” from Western Australia’s prolific Kalgoorlie-Boulder region, where nature has sculpted precious metal into intricate forms.
Kalgoorlie-Boulder, Australia
From the United States, a fluorite specimen from the Elmwood Mine in Tennessee highlights one of the country’s most celebrated mineral localities, known for its richly colored and well-formed crystals.
From Outer Space to Prehistoric Earth
Perhaps the most dramatic and timely offering, considering the recent meteor sightings in the Eastern U.S., is a massive Saint-Aubin iron meteorite from France, weighing in at an impressive 44 kilograms. Estimated between €36,000 and €44,000, this extraterrestrial giant represents a rare opportunity to own a piece of planetary history.
A smaller Saint-Aubin meteorite slice reveals classic Widmanstätten patterns, along with inclusions of troilite and schreibersite.
France / Champagne-Ardenne, France
Fossil collectors are also well served, with a Carcharodontosaurus tooth from Morocco dating back to the Cretaceous period, and a Keichousaurus fossil from China, offering a glimpse into Triassic marine life. Notably, the Keichousaurus specimen is listed with no reserve.
Cretaceous (145 – 66 million years) – Morocco
Triassic (251.9 – 201.3 million years) – China
A Global Celebration of Earth’s Treasures
Rounding out the collection is a selection of wearable mineral art, including a Lemurian quartz pendant set in silver, blending natural crystal structure with artisan craftsmanship.
Italy
Taken together, the auction reflects the global nature of the rock collecting from Myanmar to Brazil, Australia, the United States, France, Morocco and China. It highlights the deep connections between geology and humans worldwide.
How to Participate
Bidding for “Rock & Gem & Catawiki: The Mineral Collection” opens April 3 and closes April 12. Interested participants can browse the full catalog, review lot details and place bids directly through Catawiki’s online platform.
Whether you’re seeking a statement specimen, a scientific curiosity or a one-of-a-kind addition to your collection, this collaboration offers a rare chance to explore and own some of the world’s most remarkable natural treasures.
