We carefully select minerals and meteorites to maintain high-quality and authenticity standards. We only accept genuine specimens valued at €75 or more. Our experts assess condition, provenance, and appeal to ensure that bidders find scientifically or decoratively valuable objects.

Follow these guidelines to maximise your chances of a successful sale.

What we accept

We’re looking for authentic, scientifically or decoratively interesting mineral specimens that appeal to serious collectors. To be accepted, your object must:

• Fall within our accepted categories:
  • all natural and lab-grown mineral species, including: 
    • well-formed crystals (single or on matrix) 
    • rough gemstones 
    • attractive massive minerals
    • spheres, polished, and carved objects 
    • Bracelets, pendants, earrings, rings, etc., with rough or carved stones ( not faceted )
  • all natural extraterrestrial objects or tektites formed by the impact of such an object with the Earth's surface
• Have a clear indication whether or not the mineral is natural or lab-grown
• Be of collectable scientific or decorative value
• Be in good display worthy condition, professionally restored or (where necessary) have been stabilised to be of lasting conservation. Any processes on the mineral need to be listed on the description.
• Be legally sourced from countries that allow the collection and export of such specimens
• Be detailed in the Meteoritical Bulletin Database and  Mindat or accompanied by details of analysis to confirm their authenticity. The analysis needs to be from a trusted gemological institute. 
• Meet the minimum expected value of €75
   (You may combine smaller pieces in a set if thematically linked and described correctly)

What increases your chances of approval:

• Well-documented provenance, including mine/field location and collection history
• Aesthetic or rare formations (e.g., large, transparent, or geometrically complex crystals)
• Scientific or collector relevance (e.g,. fluorescent, pseudomorph, classic locality)
• Original labels from historic collections

Minimum criteria by type

To ensure quality and collectability, we apply additional criteria for certain mineral and meteorite types. 

We only accept the following shapes and sizes for Agate, Amethyst, Black Tourmaline (Schorl), Calcite, Carnelian, Fluorite, Garnet, Granite, Kambaba (type of jasper), Lapis Lazuli, Obsidian, Quartz (reconstituted), Serpentine, Shungite, Jasper (especially less colourful and patterned types):

• Spheres (single or grouped)

  • Minimum 1,000 g weight
  • Minimum diameter >10 cm

• Smaller carvings (single or grouped)

  • Minimum 200 g weight

• Bigger carvings

  • Minimum 1,000 g weight
  • Minimum diameter >10 cm

• Slices

  • Minimum 500 g weight

• Groups of cabochons

  • Minimum 200 g total weight

For all other minerals, we only accept these sizes: 

• Opals and gemstones (single) 

  • Minimum weight 10 g 

• Opals and gemstones (groups) 

  • Minimum weight 20 g 

For wearables, we only accept:

• Minerals encased in silver 
• Mineral beads connected with elastic and/or silver chain

For the following meteorites, we only accept these sizes: 

• Common (non-lunar or martian) meteorites

  • Minimum weight 5 g 

• Unclassified chondrite meteorites

  • Minimum weight 75 g 

• Classified chondrite meteorites

  • Minimum weight 10 g

📌 Examples of accepted minerals & meteorites:

What we do not accept

To keep our auctions high-quality and trustworthy, we do not accept:

• Dyed or heavily reconstructed minerals
• Incomplete, poorly cleaned, or indistinct specimens
• Unverified meteorites without documentation
• Mineral fragments lacking identifiable crystal structure or form

• Fibrous minerals related to asbestos in the amphibole mineral group, e.g., Fibrous Tremolite, Riebeckite, Chrysotile, Grunerite, Anthophyllite, Crocidolite

• Radioactive minerals (e.g., Autunite, Uranophane, Uraninite, Uranocircite, Torbernite) or those requiring handling restrictions
• Faceted stones with zirconias
  

📌 Examples of rejected objects:

Getting your submission ready

1. Fill in all the details and write a clear description

When you submit an object, you’ll see fields to guide you in providing the right information, such as type of object, mineral species, scientific name (for meteorites), origin/locality, dimensions, weight, condition, etc. These fields ensure your listing is clear, searchable, and easy for bidders to understand.

Note: To determine condition, we use the following grading system:

• Excellent – perfect condition, no damage to crystals 
• Good – minimal damage, only very minor scratches or 'dings' on crystal faces
• Moderate - some broken crystals, but the majority intact or with minimal damage 
• Poor - the majority of crystals are broken or display obvious major damage

Please also use the object description field to share:

• Unique features or notable history of the object
• Crystallographic or structural notes

• Whether the object comes with a label, ID card, or certificate

• Details of the metaphysical/healing properties of the mineral (if applicable)

• Collection or field number (if applicable)

• Known treatments (e.g., acid etching, stabilisation) or if the mineral is lab-grown (if applicable)
• Legal origin or import documentation (if applicable)
• If the object has any flaws

Tip: The more detail you provide, the easier it is for bidders to understand the value of your object – and the more likely it is to sell.

📌 Example of description:

“Fluorite from Weardale, England

Type of Object: Rough Crystal

Mineral Species: Fluorite

Origin/Locality: Hilton Mine, Weardale, County Durham, England

Dimensions: 7.2 cm x 5.8 cm x 4.5 cm

Weight: 215 grams

Condition: Good

This striking Fluorite specimen from the classic Hilton Mine in Weardale, England, showcases a captivating array of intergrown cubic crystals. The primary coloration is a rich, translucent purple, transitioning to a lovely teal-blue in areas where the crystals are thinner or illuminated from behind. The piece exhibits excellent clarity for a rough specimen, allowing for light play that highlights its internal structure.

There is minimal damage, consisting only of very minor scratches and a few subtle 'dings' on some crystal faces, consistent with its natural formation and careful extraction. The overall integrity of the crystal cluster is well-preserved.

Crystallographic Notes: This specimen displays the characteristic cubic crystal habit of Fluorite, with well-defined faces and sharp edges. Many of the individual cubes are interpenetrating, creating an aesthetically pleasing three-dimensional form. The variations in color within the same specimen are a notable feature, often attributed to the presence of trace elements and natural radiation during crystal growth.

Unique Features: What makes this piece particularly special is the distinct color zoning, a hallmark of Weardale Fluorite. When observed under different lighting conditions, the purple hues can intensify, and the blue tones become more pronounced, offering a dynamic visual experience. Hilton Mine is renowned for producing some of the finest Fluorite specimens globally, making this a desirable piece for collectors.

Metaphysical Properties: Fluorite is often associated with mental clarity, focus, and organization. It's believed to absorb negative energy and stress, promoting balance and stability. Many use it to enhance concentration and aid in decision-making processes.

Flaws: As noted in its "Good" condition, there are very minor surface imperfections consistent with a natural rough specimen. There are no significant breaks or repairs.

Comes with: This specimen comes with a small, hand-written label detailing its locality (Hilton Mine, Weardale) and a collection number”.

2. Great photos matter

Photos are the first thing bidders see – so make them count! We recommend including 8 high-quality images (possibly square format) that clearly show the condition and details of your object. This helps bidders make informed decisions and increases your chances of a successful sale.

Your photos should include:

For all submissions:

• Front, back, and side views
• Close-ups of crystal faces, inclusions, features, or matrix
• Group photos (if submitting multiple items)
• Any labels, documents, or accessories
• Details of any flaws or repairs

For grouped submissions:

• Group photos and individual shots

Tip:  Avoid photos with people, selfies, or screenshots. Use a neutral background (white or black), avoid low-quality or stock images, and aim for natural lighting. Find here more tips on how to take professional photos.

Good photos are incredibly important for mineral specimens, whether for personal collection, online display, or especially for sale. Here's why:

• Accurate Representation: Minerals have unique properties like color, clarity, luster, crystal habit, and texture. High-quality photos allow these characteristics to be accurately captured and conveyed. A poor photo can misrepresent the true beauty or important features of a specimen, leading to disappointment or a lack of interest.
• Showcasing detail and three-dimensionality: Many minerals are complex, with intricate crystal formations, delicate features, and varying depths. Good photography, often employing techniques like focus stacking and proper lighting, can bring out these details and effectively convey the three-dimensional nature of the piece, which is difficult to do with a single, flat image.
• Transparency and trust: When buying minerals, especially online, buyers rely heavily on images. Clear, well-lit photos taken from multiple angles build trust by showing the specimen comprehensively, including any minor flaws or unique attributes. This transparency helps bidders or buyers understand exactly what they're getting.
• Enhancing appeal and value: A beautifully photographed mineral stands out. Professional-looking images highlight the specimen's aesthetic appeal, making it more desirable to collectors. This can directly impact its perceived value and, consequently, its selling price.
• Documentation and Cataloging: For collectors, good photos serve as an excellent record of their collection. They help in cataloging, tracking provenance, and sharing their passion with others.

In essence, good photos are the visual "currency" in the mineral world, allowing specimens to be truly appreciated and accurately assessed.

📌 Examples of good vs. bad photos:

3. Additional proof of authenticity, provenance and legal compliance

We pay extra attention to ensure authenticity and legal compliance of objects to protect bidders and ensure a trustworthy marketplace. To ensure authenticity and compliance, you may be requested to provide:

✔ Provenance from collectors or institutions

✔ Certificates of authenticity (especially for meteorites)

✔ Museum/label references (e.g. handwritten labels or historic slips)

✔ Origin field data or mine site records

✔ Photos of professional restoration or consolidation

✔ Export documents for protected species or countries of origin

📌 Example of a textbook provenance:

Unique Features & Notable History: This specimen boasts exceptional provenance, tracing its history back to the heyday of the Copper Queen Mine's production. It was originally acquired in [Year of Acquisition, e.g., 1978] by [Previous Collector's Name, e.g., Dr. Evelyn Reed], a renowned mineralogist and collector, directly from the famed [Specific Dealer/Collector, e.g., "The Mineral Collection of John Smith"]. The piece was a prominent feature in Dr. Reed's private collection for decades and was briefly exhibited at the [Name of Exhibition, e.g., Tucson Gem & Mineral Show] in [Year of Exhibition]. Its historical significance from one of the most iconic copper deposits in the world further enhances its desirability.

Ready to sell? List your minerals & meteorites today

Selling with us is free – commission is only applied if your object sells.

Follow these guidelines to maximise your chances of success.

Register as a seller and submit your object for auction now.