3D rough diamond simulator

FacetLab

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.

WebGL + canvas fallback 57 facet polish map No pricing or appraisal

KIM-27 / Kimberley octahedron grain 14 deg / rough 2.84 ct / plan 78%

Loading renderer RayScope on Mission: balanced learner

Cleave window

Bench noteChoose a rough parcel and scan before planning. The best stone is not the heaviest stone; it is the one with the best light return at a sensible yield.

Lap pressure 54

Rough parcel

Challenge mode

Light return36Rough is unplanned.

Fire22Needs crown/pavilion balance.

Symmetry64Meet-points not polished.

Clarity riskLowNo open feathers yet.

Yield39%1.10 ct estimate.

Bench score41Try planning first.

InspectScan the rough to map inclusions before you choose the table. A visible feather under the table can change the clarity story.

Crystal orientation 0 deg

Table size 58%

Total depth 61%

Crown angle 34 deg

Bench report

Cut-

Colour-

Clarity-

Carat-

Light-

Score-

Ready for the wheel.

Finish the 57-facet map and grade the stone to generate a shareable score card.

LearnWhy cut returns light LearnHow colour faces up LearnWhen clarity is eye-clean LearnHow rough becomes carat

Embed terms

Embed it, but credit 4Cs.co.za.

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.

Compliant embed code

FacetLab is an educational simulation, not a grading report, valuation or appraisal. Always match a certificate to the physical stone. Formal 4Cs definitions: GIA 4Cs. 4cs.co.za is published by Prodiam Trading CC. For real certified natural diamonds, visit Prodiam.