- Home news contact Welcome to the GemEx Systems web site. Please make your selection below. Username Password The best diamonds are the kind everyone talks about after the party. GemEx offers you the best support to help you sell more diamonds and precious gem stones. If you do not have a password for this area, please contact us at 262-242-1111 or email us at gemex@gemex.com Copyright 2002 ...www.lambdaspec.com/index.php?gemex_Sess=c0a640b3d2f82eabe90c8791792fb684