Acceptance & Submission Guidelines

Diamonds

DiamondsPremium Positioning

Because potential buyers come to Catawiki looking for special and rare diamonds, our in-house experts select every piece for our auctions, ensuring they are ofpremium quality and are presented in the best possible way.

We do this because we aim to keep our bidders excited, allowing them to find the pieces they’re interested in and ensuring our sellers have great selling experiences.

At Catawiki, we auction diamonds of premium quality which are hard to find and appealing to passionate diamond enthusiasts and collectors.

At Catawiki, we are constantly moving forward. Our positioning is evolving into a strong premium segment which opens up opportunities for success for us and for you.

From the 14 million visitors that come to our platform every month, we gain valuable information on what they are passionate about and what they prefer to buy.With your help, we want to make sure we continuously meet this demand and offer the special objects that our growing number of bidders are excited about and want to buy.

In these guidelines, we’ve defined what the special pieces are that bidders look for in our diamond auctions. We’ll also state what we require from you to successfully place them in auction. These guidelines serve to create a level playing field between all our sellers.

We will be happy to make room in our auctions for your lots that meet this high quality demand, and we will aim to shape ourselves to better fit you.Our experts and account managers will fully support and guide you for success on Catawiki.

Thank you for being with us on this exciting journey!

Product Guidelines

For our auctions we seek and select:

● cut diamonds as well as rough diamonds that are of quality, in all colour ranges except opaque

● in the case of rough diamonds, diamonds that are always accompanied by a gemmological certificate, of valuable appearance and suitable for jewellery mounting

● diamonds of all clarities, except diamonds with inclusions causing opaqueness (for other exceptions see the Clarity Table), of decent condition and that have a sufficient quality in cut and clarity to be mounted in jewellery

● diamonds that are accompanied by a trusted gemmological certificate

● lots that have a minimum estimated value of €150

At Catawiki we auction diamonds gathered from all corners of the world.

Certified natural diamonds of premium quality

For our diamond auctions, we seek a wide range of natural diamonds that are accompanied by a trusted gemmological certificate (see details further on). This includes:

White diamonds:

Natural fancy colour (NFC) diamonds:

Colour treated diamonds:

Clarity Enhanced:

Diamond cuts

For our dedicated diamond auctions, we select cut diamonds that are ready to be mounted in jewellery:

This includes cuts such as:

● Brilliant cut

● Fancy cut

● Laser cut

● Old cut

Cuts that are not suitable are:

✘ 8/8 single cut

✘ Swiss cut

✘ Damaged and broken cuts

✓ ✓ ✓

Colour conditions

● White D to Z ● Natural fancy ● Colour treated (CT) irradiated/HPHT● CT black(ish) (opaque)

Suitable D colour Suitable F colour Suitable M color

Suitable fancy colour Suitable fancy colour Suitable treated item

Suitable HTHP treatment

Although we find a wide range of colours suitable, the following is not suitable for our auctions:

✗ Colour coated

✓✓

Clarity conditions

For this auction, we accept diamonds that are of suitable clarity or in more specific terms, belong in a certain clarity range. This means that the items suitable for this auction are as follows:

● FL to I3● AIG (IL) clarity grade IF to I3

Note: I1, I2 & I3 can only be accepted without a reserve price

● Clarity I1, I2 & I3 have a minimum total carat weight requirement (see next page for details)

● Fracture filled (CE) clarity grade IF to SI1● Laser drilled clarity grade IF to SI1

In terms of clarity, there are certain ranges that do not live up to our standards and these are:

✗ Fracture filled (clarity treatment) (CE) clarity grade SI2, I 1/2/3✗ Laser drilled (clarity treatment) clarity grade SI2, I 1/2/3✗ Heavy inclusions causing opaqueness

Clarity conditions

Carat range Colour Range Extra requirements IF VVS1 VVS2 VS1 VS2 SI1 SI2 I1 I2 I30.01 - 0.03 White colours/ NFC Parcels only (total 1.00 ct +) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗ ✗

0.04 - 0.07 White colours/ NFC Parcels only (total 0.75 ct +) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗ ✗

0.08 - 0.10 White colours/ NFC Parcels only (total 0.50 ct +) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗ ✗

0.12 - 0.14 All colours Brownish and yellowish (discoloured) only in parcels 0.75 ct +

✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗ ✗

0.15 - 0.17 All colours Brownish and yellowish (discoloured) only in parcels 0.50 ct +

✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗ ✗

0.18 - 0.22 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗

0.23 - 0.29 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✗ ✗

0.30 - 0.39 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

0.40 - 0.49 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

0.50 - 0.69 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

0.70 - 0.89 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

0.90 - 0.99 All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

1.00 - +++ All colours ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

Minimum expected auction revenue of €150 ✓ = accepted ✗ = not accepted

Guidelines for the different clarity conditions we accept:

Accepted standard treatments

● Irradiation treatment, which leads to a variety of coloured

diamonds (for example: yellow, orange, pink)

● HPHT (high-pressure, high-temperature) treatment

● Fracture filled (CE) with clarity grade ranging from FL to SI1

● Laser drilled with clarity grade ranging from FL to SI1

The following standard treatments are accepted for our selected diamonds:

Irradiation treatment

HPHT treatment

The following standard treatments are not suitable for our selected diamonds:

✗ Fracture filled with clarity grade SI2, I 1/2/3

✗ Laser drilled with clarity grade SI2, I 1/2/3

✗ Colour coated

Colour coated treatment

✓

✓

✗

Condition

● may present small damage, but the seller needs to declare

these damages and there should be a possibility of repair

through recutting or repolishing

✗ Submissions with damages that would lead to them

breaking during the setting procedure are not suitable

for our auctions.

For our auctions, we accept diamonds that are natural, undamaged and have a decent clarity. This means that the items submitted:

Damaged diamonds ✗The expert reserves the right to reject a submission if the scratches/damages surpass a

level and the value of the diamond is affected.

Authenticity / Certification RequirementsBuyers are more likely to bid on your lot if they know it’s certified as being authentic. This is why we always ask to see certificates from trusted gemmological institutes for all our submissions.

To help you have a better understanding of the level of certification required for our diamond auctions, we have the following list of accepted institutes:

● Gemological Institute Of America: https://www.gia.edu/

● HRD Antwerp: https://hrdantwerp.com/en ● International Gemological Institute:

http://www.igi.org/ ● The International Institute of Diamond

Grading and Research: https://www.iidgr.com/ ● Instituto Gemológico Español: https://ige.org / ● Antwerp International Gemological

Laboratories: http://www.aiglaboratories.com/ ● Istituto Gemmologico Italiano:

https://www.igi.it/#accept

Examples of trusted authentication certificatesThese following certificates are generally considered to carry sufficient details to be trusted by our experts:

● GIA - Gemmological Institute of America (worldwide)● HRD - Hoge Raad voor Diamant (Antwerp)● IGI - International Gemological Institute (worldwide)● AIG - International Gemological Laboratories (Antwerp)● IGE - Instituto Gemologico Espaniol (Spain)● EGL (US) - European Gemological Laboratory ● NEL - Nederlands Edelsteen Laboratorium (Netherlands)● IGI - Istituto Gemmologico Italiano (Italy) ● IIDGR - International Institute of Diamond Grading &

Research (De Beers)● AIG - International Gemological Laboratories (Israel) only

for clarity grade FL to SI

Please be aware that we do not consider the following certificates to be suitable:

✗ IGL✗ AnchorCert✗ DGI✗ CISGEM✗ IJGC✗ EGL (B)✗ GIL✗ CGL

On the off-chance our experts consider the certificate to be overrated, the submission might need further clarification from the seller.

Lot Description

To help encourage potential buyers to bid on your lot, you should include a detailed description of your object(s). This should be thorough and honest, and follow the guidelines on the next page.

Submission Guidelines

Potential buyers are more likely to bid on lots with a good description, all relevant information displayed clearly and, of course, beautiful photos.

Submission guidelines

If you are using our website to upload your lots, tips will appear to give you guidance about what information we need to know about your lot. The fields that you fill in help to present the information in a way that’s easy for the buyer to read. The required information includes:

● Diamond weight (in carat)

● Cut

● Colour (please mention treatment if applicable)

● Clarity (please mention treatment if applicable)

● Treatment

● Certificate (number certificate, date and place)

● Sealed in blister if applicable - laser inscribed if applicable ● Additional description: all detailed and relevant information about the diamond, shipping, tax etc.

When adding extra details, please mention any additional cost or additional steps that the buyer might come across when purchasing your item.

Photographs

To allow our experts, as well as our bidders, to get the right impression of an item, we require:

● a 360 degree view of the item

● clearly readable image(s) of the certification report

Submission Guidelines

Including strong photographs is key to catching buyers’ eyes, ensuring they bid on your lot. Of course, buying online means potential bidders do not get a chance to see your lot in person, therefore detailed and high quality photographs are very important.

Image guidelines

● Photograph the diamond in front of a plain and neutral background, preferably a white wall.

● Photos should show nothing else but the diamond(s) you want to put up for auction and the paper certificate in its own picture.

● Make sure you avoid any distracting background, only the loose diamond, the sealed or the paper certificate are allowed in the picture.

● All images must be original photographs taken by the seller. Stock pictures, other sellers’ pictures and screenshots are not suitable. Images in which the object is held by a person are not appropriate.

● Bidders are interested in seeing as many details as possible. Therefore, please always include images of the top and back of the blister in sealed diamonds and the crown, girdle and pavilion in loose diamonds. If you have several items in one lot, please photograph all offered items together as well as every item separately. All submissions require a photograph of the paper certificate.

● Provide sharp, specific images of details, such as inclusions. Unenhanced images are preferred.

Image guidelines - examples

Thank you