AN ADVANCED DIGITAL COMPUTER GAUGE THAT MEASURES GEMSTONE DIMENSIONS AND CAN ESTIMATE GEMSTONE WEIGHT AND IDENTITY FOR 9 DIFFERENT CUTS. PRESIDIUM GEM COMPUTER GAUGE MEASURES THE DIMENSIONS AND ESTIMATES THE WEIGHT OF LOOSE AND MOUNTED GEMSTONES WITH PRECISION, SPEED, AND EASE. IT IS THE ONLY GAUGE IN THE INDUSTRY THAT IS ABLE TO GIVE DIRECT ESTIMATION OF THE WEIGHT OF VARIOUS GEMSTONE OF A RANGE OF 9 POPULAR CUTS, GIVING USERS THE CONVENIENCE OF NOT HAVING TO DISMOUNT THEIR GEMSTONES FROM ITS JEWELRY SETTINGS. AFTER ENTERING THE WEIGHT AND THE MEASUREMENTS OF A GEMSTONE, THE GEM COMPUTER GAUGE IS ALTERNATIVELY ALSO ABLE TO BE USED TO ESTIMATE THE IDENTITY OF THE GEMSTONE, BY COMPUTING ITS S.G. VALUE AND REFERENCING THE INTERNAL STORED DATABASE. WITH PGCG'S COMPUTER INTERFACING, GEMSTONE MEASUREMENT RECORDS CAN BE EASILY IMPORTED AND PRINTED. PGCG ALSO COMES WITH A SOFTWARE THAT LISTS THE S.G. VALUE, R.I. VALUE, AND HARDNESS MEASUREMENTS OF 133 COMMON GEMSTONES IN THE MARKET FOR HANDY REFERENCE. Measures from 0.0 to 25.0mm Accuracy: 0.01mm / Tolerance: 0.02mm Digital mm/ct display Automatically shut off when idle for 10 minutes Auto-magnetic shut-off when placed in carrying case Computer interface display with USB (Universal Serial Bus) connectivity Attachment for high setting jewellery provided Specific Gravity (S.G.) dictionary for quick and easy reference included