Proportion Scanners
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The Sarin digital scanner measures diamond proportions 10 times faster and more accurately than previous methods.
Quick and accurate proportion measurement made it feasible for labs like the American Gem Society to offer cut grading services. GIA uses scanners to measure the table size and dimensions of diamonds, but it also collects all the angles etc which it uses to "finger print" diamonds for its own internal purposes to screen for resubmitted diamonds; e.g. dealers hoping for a better grade. GIA has also identified resubmitted treated HPHT diamonds using its Sarin – Horizon program. Ogi makes similar at a lower price, but all labs currently use Sarin. To use HCA we would prefer Sarin too; Ogi use a different less accurate method to calculate the critical pavilion angle. Sarin (and Ogi) now also measure minor facets, and can create 3D models, but with less accuracy than OctoNus' new scanner Helium. Their next generation scanner measures facet angles with much greater accuracy but also measure the azimuth or direction that each facet faces (i.e. do opposite facets exactly face each other?) which is very important for 3D models. AGS and GIA need more accurate 3D models for their new cut grading systems, so it is very likely they will begin using Helium scanners. Discuss on the Forum Brilliance, Fire and Scintillation » |
 Sample of the Sarin Report  Sarin cut optimisation software |