Diamond Proportion Scanners: Sarin, Ogi, Helium

Diamond Tutorial

Proportion Scanners

Basic 4C's
	Introduction
	Diamond Grading Report
	Diamond Carat Weight
	Diamond Cut
	Diamond Clarity
	Diamond Color
	Diamond Anatomy
	What to buy?
Fancy Cut Diamonds
	Fancy Shapes
	Princess Cut Diamond
	Radiant Cut Diamonds
	Emerald Cut Diamonds
	Asscher Cut Diamonds
	Cushion Cut Diamonds
	Oval Cut Diamonds
	Marquise Cut Diamond
	Pear Cut Diamonds
	Heart Cut Diamonds
	Trillion Cut Diamonds
Advanced Info
	Tolkowsky Ideal Cut
	Crown and Pavilion
	Holloway Cut Adviser
	AGS Ideal Cut
	Firescope & Ideal-Scope
	Hearts and Arrows Diamonds
	Table Size
	Fish-eye
	60:60
	Spread
	Diamond Girdle Thickness
	Diamond Culet
	Diamond Symmetry
	Diamond Polish
	Diamond Fluorescence
	Proportion Scanners
	Brilliance, Fire and Scintillation
	Diamond Glare
	Pricing & Lab's
	Treatments & Synthetics
	Investment
AGA Cut Grading
	Round Brilliant
	Princess
	Emerald & Radiant
	Marquise, Pear, Oval, Heart
	Glossary
	References
	Disclaimer
Further Reading
	Diamond Prices
	Engagement rings
	Diamonds :)

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.

Next Diamond Tutorial: Brilliance, Fire and Scintillation »

Discuss Diamonds in the Pricescope Forum

Sample of the Sarin Report

Sarin cut optimisation software