Thank you for reading this guide. The link below is for a workshop that I hosted for eBay a few years ago. Although the basic information and advice are still relevant and helpful, a few things have changed since the workshop was published; for example, Billpoint, eBay's on-line payment service, no longer exists and GIA now offers a Cut Grade on their new reports, starting in January 2006; they use different measurement parameters than AGS to arrive at their cut grade.  Also, other laboratories besides GIA can now identify the HTHP color enhancement in diamonds. 

http://forums.ebay.com/db2/thread.jspa?threadID=32894