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The RDI and RAPI Index

Explains the Rapaport Diamond Index and the RapNet Diamond Index

Philippa Corrick avatar
Written by Philippa Corrick
Updated over 2 months ago


RDI: Index of the Rapaport Price List

  • The RDI Is the average of the 25 highest categories on the Rapaport price list (D IF – H VS2)

  • RDI usually references 1ct, but you can calculate RDI for every size

  • Unlike the RAPI, this is not published regularly.


RAPI: The RapNet Diamond Index

An index of the market prices

  • The RapNet Diamond Index (RAPI) is the average of the cheapest/best-priced 10 diamonds for Round, D-H, IF-VS2, GIA Graded, Rapaport Specification 2 or better diamonds offered for sale on RapNet. ie: The top 25 highest categories (RDI)

  • While the RAPI indices are available for 0.30 Ct, 0.50 Ct, 0.70 Ct, 1.00 Ct,2.00 Ct, and 3.00 carat size categories, the primary index is one carat size.

  • The RAPI is published daily in TradeWire and on the RapNet home page.


More Diamond Pricing Tools

Visit the RapNet diamond pricing tools page to learn more ways to make diamond pricing easier for you and your customers.

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