A serious purchase of a diamond is never made at an auction house such as Sothebys or any other auction. You have to go to an authorized agent of
the few markets that exist and that mark the Rapaport quotes. That is, Antwerp, Telaviv, London or New York. Possibly the most active is Antwerp.
The diamond offers all the guarantees because it comes with a certificate that will detail all its characteristics such as cut, purity, color,
brightness, polish, symmetry, cut clarity and weight. See the︀ picture. The diamond is enclosed in its sealed methacrylate container that can only
be opened︁ by breaking it. The HRD certificate is only valid while the container is intact. The︂ certificate also carries an X-ray and a drawing that
marks the small impurities of the︃ diamond. Therefore it is unforgeable.
The price is essentially determined by the elements that appear︄ in the rapaport and that are weight, color and purity. The other elements such as︅ symmetry,
cut, table, table, etc., are left to the discretion of the buyer (who will︆ normally be a professional reseller) and who will always find a minor problem in
some of these elements to substantially lower the price. If the table is at 57%, it︇ will tell you that it needs it at 65%. And that the crown is at︈ 15%
when what you are looking for is a 25% because he must to mount︉ it on a ring. Finally there will always be an excuse to lower the price︊ of Rapaport
wholesalers by 20 or 30%.
In the photos you can see in detail︋ what I mean.
Maybe if a diamond were really exceptional in weight and with a︌ high degree of purity and I mean pieces of +8 CT, it could have a︍ buyer that would be very
close to the price of the official quotation
