Digital scanners are used to measure diamond proportions. They are 10 times faster and more accurate than the previous microscope or visual estimation methods. Scanners made it possible for labs like the American Gem Society to grade cut. AGS reports list the important proportion of information you need to use HCA .
GIA uses scanners to measure the table size and dimensions of diamonds. It collects all the angles etc which it uses to “fingerprint” diamonds to screen for resubmitted diamonds; i.e. dealers hoping for a better grade.GIA has also identified resubmitted treated HPHT diamonds using its Sarine – Horizon program.
Sarine was the first scanner company, followed by Ogi who are not favored by labs, but less expensive.
Sarine can create 3D models, but with less accuracy than OctoNus ‘ new scanner Helium. This next-generation scanner measures facet angles with much greater accuracy, and also measures the azimuth or direction that each facet faces (i.e. do opposite facets exactly face each other?). Helium 3D models are the most accurate and are used by AGS for Rayacing with their new Cut Grade System released in 2005.
Precious Metals was an agent for Sarine, but is now the Australian Pacific distributor for Helium.
Sarine and Helium scans work with DiamCalc from OctoNus to enable us to produce computer-generated ‘virtual’ Ideal-scope images of any diamond. Precious Metals use this technology to buy diamonds directly from overseas diamond cutters.