We carefully select diamonds to maintain high-quality and authenticity standards. We only accept natural, certified diamonds. Our experts review every submission to make sure bidders find rare and valuable objects.
Follow these guidelines to maximise your chances of a successful sale.
What we accept
We’re looking for high-quality diamonds that appeal to serious collectors. To be accepted, your object must:
For all submissions:
- Be of natural origin, well-cut (=ready to be mounted in jewellery) and undamaged,
- Be certified by an approved gemological laboratory
- Be white (D–Z), natural fancy colour (NFC), or colour treated (e.g. HPHT, irradiation). Note: we will treat undetermined colour origin on report as treated colour.
- Be within clarity range FL to I3, provided the diamond is transparent and attractive
- Minimum carat weight for single white diamonds 0.20 ct and for Natural Fancy Coloured Diamonds 0.30 ct
- Comply with the Kimberley Process
Important note: Due to regulatory requirements, only professional sellers registered with a VAT number will be permitted to submit diamonds for sale in our diamond auctions. If you're a professional seller but haven't completed registration, contact our support team to complete your account
As an exception, private sellers will be allowed to resell loose diamonds if they were previously purchased on Catawiki. These must be sold on the same account they were purchased with and new images that meet the requirements in the submission guidelines must be provided.
For parcels:
- Consist of 3 stones or more
- Be sealed in blister or sealed bag (with certificate number label)
- Be well-calibrated on quality, (sieve) size / weight
- Include a physical paper certificate (not electronic or photocopied), ID cards are accepted only for parcels
For high-value submissions (€20,000+):
- Be certified by GIA, HRD, or IGI
- Include a physical paper certificate (not electronic or photocopied)
- Be laser engraved, or sealed
📌 Examples of accepted objects:
What we do not accept
To keep our auctions high-quality and trustworthy, we do not accept:
- I2 and I3 diamonds that become non-transparent/opaque
- Lab-grown or uncertified diamonds
- Colour-coated or clarity-enhanced diamonds
- BGM stones (brown-green-milky)
- Poorly cut or broken stones
- Rough diamonds
- Diamonds with surface-breaking inclusions or extreme cloudiness
📌 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. carat, cut, colour, clarity, lab, 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
- Certificate date and number
- Cut grade, fluorescence, dimensions
- (When clarity not mentioned on the report) opinion on the clarity clearly mentioned as ‘Seller opinion’
- Where the object came from/how it was obtained
- If the object has any flaws
- VAT/import tax details
- Shipping method, any restrictions
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:
“Natural Diamond graded by IGI.
Including its IGI report.
Sealed & Laser inscribed.
IGI report number: 709504686
Shape: Square Emerald Cut
Carat Weight: 1.00 carat
Color: F
Clarity: VVS1
Polish: Excellent
Symmetry: Excellent
Fluorescence: Very Slight
More information is listed in the IGI diamond report.
- Registered shipping with FedEx. Delivery usually takes 1 to 4 workdays.
- There are no additional taxes on this diamond for buyers inside of Europe.
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.
For deliveries to Belgium : only diamond dealers with a licence are permitted to import loose diamonds to Belgium and the shipments will be released by the Diamond Office in Antwerp”.
2. Great photos matter
Photos are the first thing bidders see – so make them count! We recommend including at least 5 high-quality images 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:
- Full front, back, and side views of the diamond
- Close-ups of any inclusions or features
- A clear image of the original paper certificate
Additional images by object type:
- Pairs and Parcels: group shot and individual diamonds
- Sealed diamonds: blister front and back
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:
Ready to sell? List your diamonds 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 diamonds for auction now.