All diamond price lists are published in a printed format, and intended for use by the wholesale and retail jewelers. There is no industry standard retail consumer price list.
The majority of diamond cutters and wholesalers use one of several printed price report as an industry standard, when they sell diamonds to retail jewelers. The retail jewelers occasionally will show a copy of this printed price list to the retail shopper, giving the impression that the list will help them shop for a diamond.
All the diamond industry wholesale price lists mentioned above are published in a similar format with spreadsheet style grid boxes for pricing. The missing information on all printed static price lists are calculations for cut proportions. This creates a wide margin for error in the use of these static price lists.
All these price lists do not factor in the “cut proportion factors” of a diamond, which can affect the final price of a certified diamond by up to 60%. The cut of the diamond is not the shape of the diamond. The cut or make of the diamond is the proportions information found in the proportions section of a diamond certificate, issued by gemology laboratories. This is the important information that is missing from all of the published static price lists.
The cut is the relationship between the following proportion factors: depth %, table %, girdle thickness, crown angles, and pavilion depth %, length to width ratios of fancy shape diamonds, symmetry and polish. The other price lists do not include any of these factors in their static price lists, or they give cut proportion ranges that are not precise.
These price lists are not automated, cannot transmit evaluated pricing information over the Internet, and are not patented for use over the Internet. The cut factor is not included in all the static price lists, but is included in the Diamond Inspector patented diamond pricing service.
Other factors not included in the static price lists and included in Diamond Inspector, are price calculations for length to width ratios of fancy cut diamonds, fluorescence, differences in the qualities of lab certificates, special demand carat weight sizes, and branded specialty cut diamonds. There are too many factors that affect the prices of diamonds in the marketplace, that are not included in the static price lists.
Leave off one or two price factors, and the discount price below the price lists are inaccurate. These factors are all computed within Diamond Inspector calculations, to arrive at a market price. Diamond Inspector pricing does not offer a list price, but a real dollar value market price within a 5% to 8% range. This is a more accurate price guide, which includes all the calculations that an appraiser would use in evaluating and arriving at a price for a diamond.