We have always priced diamonds against one reference point — the Rapaport list. It is the benchmark the whole trade reads from, and once you understand how it works, a great deal of the mystery around diamond pricing simply falls away.
What the list actually is
The Rapaport list is a weekly published table of benchmark prices for certified diamonds, organised by carat weight, colour and clarity. It is not a shop’s price tag and it is not what you pay. It is the agreed reference — the number every dealer in Antwerp, Mumbai or Beirut has open when a stone changes hands. It has long been the language we buy and sell in.
What matters for you, the buyer, is this: a real price for a certified natural diamond is always built in relation to that benchmark. It is never invented from nothing.
How a price is actually built
The mechanism is simpler than most people expect. You take the benchmark figure for that stone’s weight, colour and clarity, and then a discount is negotiated off it. The final price is the benchmark minus that discount — that is the whole arithmetic.
So the real question is never “what is the list price?” but “what is the discount, and is it honest?” Two stones can sit on the exact same line of the table — same weight, same colour, same clarity grade — and trade at noticeably different discounts. The gap between them is where all the real knowledge lives.
What the discount really reflects
The grade on the certificate tells you the stone’s weight, colour and clarity. It does not tell you how the stone behaves. The discount is where the rest of the truth is written:
- Cut quality — how well the stone is proportioned and finished. Two diamonds of identical grade can return light very differently. A dull, badly-cut stone earns a deeper discount; a lively, well-cut one holds its value close to the benchmark.
- Fluorescence — how the stone reacts under ultraviolet light. In some stones it is harmless or even flattering; in others it leaves a milky, hazy look. It moves the discount, sometimes sharply. We explain it properly in our note on fluorescence.
- How lively the stone looks in the hand — the thing a grade can never capture. Some diamonds simply sing under light. The trade pays for that, and the discount reflects it.
So a smaller discount is not a seller being greedy, and a larger discount is not a bargain. The discount is information. Read correctly, it tells you what kind of stone you are looking at.
Why hiding the benchmark hands a seller all the cards
Here is the part that should concern any buyer. If you do not know where the benchmark sits, you cannot tell whether a discount is generous, fair or fiction. A seller who keeps the reference point to himself is not protecting a trade secret — he is removing your only way of checking him.
This is the engine behind almost every diamond story that ends badly. A stone offered far below the honest band is rarely the gift it appears to be; far more often the grade on the paper does not match the stone in the box, or the certificate belongs to a different diamond entirely. We have written the fuller version of how this plays out in the half-price diamond story. The benchmark is the buyer’s defence. Take it away and the seller holds every card at the table.
How we use it — and what we show you
We came up through the wholesale side, supplying loose certified stones to the jewellers of Lebanon and the region long before any reached a window. The benchmark was our daily working tool, not a curiosity. We have carried that habit straight into selling to the public: for every stone, we show you where it stands against the list and explain the discount it carries — the cut, the fluorescence, the way it behaves under light. The moment a reference point is hidden, the buyer has already lost.
If you want to apply this in practice, our buyer’s checklist for Beirut walks through what to ask for and verify. And when you are ready to look at actual stones with their certificates and their position against the benchmark, you can view our loose certified diamonds and judge each one on the same terms the trade does.
