We carefully select gemstones to maintain high-quality and authenticity standards. We only accept natural, certified gemstones valued at €150 or more. Our experts review every submission to ensure bidders find rare, high-quality, and valuable pieces.

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

What we accept

We’re looking for authentic, natural gemstones that appeal to collectors and enthusiasts. To be accepted, your object must:

• Be natural and either untreated or treated using standard industry practices
• Be in good condition with a cut* and clarity suitable for mounting in jewellery. The following cuts are accepted:
  • Brilliant,  cabochon and fancy cuts
• Be accompanied by a certificate from a trusted gemological institute 
• Meet the minimum expected value of €150
   (You can combine objects in one submission to meet this threshold)

We accept the following species:

• Beryl Emerald, Corundum Ruby and Sapphire, Chrysoberyl, Tourmaline Paraiba, Grandidierite (only transparent) accepted >1.00 ct 
• Beryl Aquamarine and Morganite, Spinel, Tanzanite, Tourmaline Rubellite, Zircon, Jade (Jadeite & Imperial) accepted >2.00 ct 
• Tourmaline, Peridot, Garnet, Opal (untreated), accepted >5.00 ct 

The following species are only accepted in large sizes of good quality (>10 ct):

• Diaspore, Kunzite, Spodumene, Sphene, Sphalerite, Labradorite (only transparent), Quartz (amethyst, ametrine, citrine), Topaz, Star corundum
  
  

📌 Examples of accepted objects:

What we do not accept

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

• Lab-grown (synthetic) or composite gemstones
• Stones with low quality in proportions, transparency, finish, or light performance

• Translucent and opaque gemstones 

• Non-traditional or excessive treatments, such as:
  • Coloured dyes, fillers, or lead glass (e.g., in emeralds or sapphires)
  • Coated gemstones (e.g., Mystic Topaz)
  • Dyed, sugar-treated, or smoked opals
• Uncertified stones 
• Gemstone types not acceptedfor auction:
  • Aventurine, Charoite, Variscite, Bloodstone, Hematite, Chrysocolla, Coral, prasiolite, smoky quartz, rose quartz, yellow quartz
    
    

📌 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, e.g. number of stones, type of gemstone, weight of each stone, cut, colour, clarity/transparency, any treatments applied, certification details, country of origin (only if specified on the certificate), whether the object is sealed, etc. These fields ensure your listing is clear, searchable, and easy for bidders to understand.

Please also use the object description field to share:

• Unique features or notable history of the object
• Laboratory date and report number
• Exact measurements of the gemstone
• Any imperfections not listed in the report
• Light source used for photography (if not daylight)
• Country of origin disclaimer if not included on the report
• Notes about potential treatments (e.g., “This type of gemstone is commonly treated/heated”)
• Shipping restrictions by country
• Any VAT or import tax implications the buyer may face

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. Find here more tips on how to write a clear, accurate description. 

📌 Example of a well-written description:

“GRS Report No : GRS2024-117637

Weight : 6.72 cts 

Species : Grossularite Garnet 

Color : Vivid to Deep Green 

Shape : Cushion 

Measurements : 11.66 x 10.09 x 7.15 (mm)

Comments: No indication of thermal treatment

Origin : East-Africa  (if specified in the report only)

Please check GRS Report for further information.

Shipping will be via FedEx with full insurance delivery service. 

Customs and taxes:

Your country of residence may apply extra customs duties and import taxes. Extra VAT calculations are based on the tax system of your country.

We cannot be held responsible for any extra expense incurred for importing items into the purchaser's country of residence. *Please note that the buyer is always responsible for customs duties on international shipments. If you want to know the detailed amount, please contact the tax office in your area.

Important: For deliveries to France, a customs broker is required to handle the clearance process. This may result in additional costs, which are also the buyer’s responsibility. If you would like to know the exact amount, please contact the customs or tax office in your area”.

2. Great photos matter

Photos are the first thing bidders see – so make them count! We recommend including 5 high-quality images showing the gemstone from the top, bottom, and sides. This helps bidders make informed decisions and increases your chances of a successful sale.

Your photos should include:

For all submissions:

• Sharp close-ups showing all angles
• A clear, readable image of the full paper certificate

Additional images by object type:

• Sealed objects: include front and back images of the seal and certificate. 

Tip: 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.

📌 Examples of good photos:

• Example of natural and realistic images required for unsealed gemstones 

• Example for sealed gemstones (front and back seal images), close up gemstone images and certificate

3. Additional proof of authenticity

We pay extra attention to ensure authenticity of high-value objects and exclusive to protect bidders and ensure a trustworthy marketplace. We require certification for all gemstone submissions.

You must provide a full original certificate from one of our approved gemological institutes.

X We do not accept ID cards or preliminary reports.

Note: For rare or high-value gemstones, a second certificate may be required.

Ready to sell? List your gemstones 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 gemstones for auction now.