The Rapaport Group provides knowledge-based information services supporting the development of free, fair, efficient, competitive, and profitable diamond and jewelry markets. Their primary websites are Diamonds.net, RapNet.com, and Rapaport Auctions.
The Rapaport Price List API provides access to Rapaport price sheets, price changes, and specific prices. The API is available as a SOAP web service and as HTTP POST calls. XML and JSON formatted responses are supported.