FacetLab
Polish a rough diamond in your browser, learn the 4Cs
FacetLab launched on June 28, 2026 with 1 votes.
What it does
FacetLab is a free, open-source WebGL learning simulator from 4Cs.co.za. Inspect a rough diamond crystal, reveal inclusions, plan the proportions, polish the facets of a brilliant cut, and generate a finished 4Cs scorecard (cut, colour, clarity, carat). It runs entirely in your browser. Educational only: no signup, no pricing, no appraisal. Source open on GitHub.
FacetLab is a free 3D browser simulator from 4Cs.co.za. Plan, cleave and polish rough diamond crystal while learning cut, colour, clarity and carat.
Diamond education, written by an employee of Prodiam, a diamond cutting works in Bedfordview, Johannesburg. Not an independent comparison of dealers. Plan, cleave and polish rough diamond crystal in a browser. Watch light rays return or leak, expose inclusions, finish 57 virtual facets, then generate a 4Cs bench report. Finish the 57-facet map and grade the stone to generate a shareable score card. Public embeds are permitted only when the embedding page includes a visible credit link back to this FacetLab page. The iframe alone is not enough. The source is open under AGPL-3.0-or-later and the data is CC BY 4.0, both attribution-required. FacetLab is an educational simulation, not a grading…from 4cs.co.za
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