What the Rapaport list is
The Rapaport Price List (the RAP) is a weekly benchmark of polished diamond prices, broken down by shape, carat band, colour, and clarity. The trade quotes against it. A stone is rarely sold at full RAP. It is sold at a discount or premium expressed as RAP-minus or RAP-plus. A dealer saying minus 30 means 30 percent below the list price for that exact spec.
What RAP-minus means for you
RAP-minus is where the real negotiation lives. Two diamonds with the same certificate can trade at very different discounts based on cut make, fluorescence, and how liquid the stone is. A retailer buys at a RAP-minus, then sells to the public at or above full RAP plus margin. A manufacturer-direct seller can pass more of the RAP-minus to you, which is why the same certified stone can land 30 to 50 percent cheaper.
Why retail prices are higher
Retail price is not only the diamond. It carries shop rent, staff, stock financing, marketing, and brand margin. None of that changes the stone in the ring. When you buy from a cutting works rather than a chain, you strip out most of those layers and pay closer to the trade number.
How to use this when buying
Get the full certificate spec first (shape, carat, colour, clarity, cut). Then ask any seller for the loose-stone price separated from the setting. Prodiam, as the direct face of a cutting works, prices from the trade side rather than the mall side, so you can sense-check a retail quote against a manufacturer-direct one for the same GIA spec.
Decision table
Use the details, not a shortcut.
| Term | What it means | Why it matters to a buyer |
|---|---|---|
| RAP | Full Rapaport list price for a spec | The ceiling reference, rarely the real price |
| RAP-minus 20 to 40 | 20 to 40 percent below list | Typical trade range for a sound stone |
| Retail mark-up | RAP plus brand margin | What you avoid buying manufacturer-direct |
Direct answers
Common questions
What is the Rapaport price list?
It is a weekly international benchmark of polished diamond prices by shape, carat, colour, and clarity. The trade quotes stones as a discount or premium to it, known as RAP-minus or RAP-plus.
Can a member of the public see Rapaport prices?
The full list is a paid trade subscription, but you do not need it. Ask a manufacturer-direct seller like Prodiam to quote the loose-stone price for a GIA spec and compare it against a retail quote for the same stone.
Why is the same diamond cheaper from a cutter?
A cutting works sells closer to the trade RAP-minus price and carries far less rent, brand, and stock-financing cost than a mall retailer, so more of the discount reaches you.