What is your diamond worth?
Enter the four C’s, choose the certifying laboratory and add your certificate number if you have one. You immediately receive an indicative range.
- Carat
- Weight
- Cut
- Cut
- Color
- Colour
- Clarity
- Clarity
We buy natural diamond only. We make no offer on laboratory-grown stones (lab-grown) – that market moves too much for us to name a price you can do anything with.
Fill in the details from the certificate and press Calculate the value. We then fetch the trade price that applies to this combination at this moment.
This is an indication based on the trade price at this moment. When we buy, we recalculate with the price shown on this page at that moment – it moves with the market. Our gemmologist makes the final offer once he has assessed the stone, free of charge and without obligation at our head office in Eindhoven.
My list
Nothing on the list yet. Calculate a stone and add it – that way you bring your ring and your gold chain to one and the same appointment.
The four C’s in brief
- Carat – the weight, where one carat is 0.2 grams. The price per carat rises in steps at round boundaries such as 0.50, 1.00 and 2.00 ct.
- Cut – how well the stone has been cut. This is the only C decided by human hands, and it weighs heavily: a poorly cut stone looks dull, however clean it may be.
- Colour – from D (completely colourless) to Z (distinctly yellow tinted). The difference between two consecutive letters is barely visible to the naked eye, but it certainly shows in the price.
- Clarity – the extent of inclusions, from FL (flawless) to I3. From SI2 onwards inclusions are sometimes visible to the naked eye.
Privacy. This calculator works entirely in your browser. What you enter, including the certificate number, is not sent anywhere and not stored for as long as you do not book an appointment.
Certificate or not?
A report from GIA, HRD, IGI or AGS records the four C’s objectively. That makes our valuation quicker and our offer usually sharper, because there is less uncertainty in it. Without a certificate our gemmologists assess the stone themselves – free of charge as well, but with a slightly more cautious estimate.
Questions about the diamond calculator
Why do I get a range and not a fixed amount?
Diamond cannot be valued exactly at a distance. Two stones with identical paperwork can differ in reality in fluorescence, symmetry and finish. That is why we show a range and only make the definitive offer with the stone in our hands.
Where do I find my certificate number?
On the laboratory report, usually in the top right-hand corner. On many stones the number is also laser-inscribed on the girdle, where it is visible under a loupe. Our gemmologists can look it up for you at the table.
What if I do not have a certificate?
That is no problem. Choose ‘No certificate’ in that case. Our gemmologists assess the stone themselves, and that costs you nothing. We do then work with a slightly more cautious estimate, because there is more that we cannot rule out.
Why is a laboratory-grown diamond worth so much less?
Synthetic diamonds are chemically identical but can be produced without limit. The market value therefore lies structurally far below that of natural stones. We recognise the difference with dedicated equipment and always tell you which of the two you have.
What happens to my certificate number?
Nothing, as long as you are only calculating: the calculator works entirely in your browser and sends nothing on. Only when you book an appointment and include the number do we use it to look up the report.
Is your question not listed? Ask it below, call 085 060 3009 or go to contact.
A question about the diamond calculator?
Ask it here. You will receive a personal reply by email, usually within one working day – no automated message and no phone call you did not ask for.
- An answer from a valuer, not from a template
- We keep your question so that you need not repeat anything
- No sales pitch afterwards
Have your diamond assessed
Our gemmologists are at the head office in Eindhoven. Free and without obligation.