Gem faceting, reimagined
Plan, design & render gemstones
in your browser.
The whole faceting workflow in one place. Built for cutters who see the gem before the first cut. From rough to remarkable.
- Realistic renderingTrue brilliance and color, previewed live as you design.
- Best-yield rough plannerFit the finished gem inside your rough — before a single cut.
- Guided creatorFrom blank to finished diagram, one tier at a time.
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A complete gem faceting workflow, in your browser
Realistic rendering
GemDiagram renders true brilliance, dispersion, and color as you design, so the preview on screen matches the finished stone — no guesswork between diagram and gem.
Best-yield rough planner
Model your actual rough and fit candidate cuts inside it before you commit. See yield and waste up front, and pick the design that gets the most carat weight from the stone you have.
Guided creator
New to faceting design? The guided creator walks you from a blank canvas to a complete, cuttable diagram one tier at a time, with sensible defaults at every step.
Frequently asked questions
What is GemDiagram?
GemDiagram is a browser-based tool for planning, designing, rendering gemstone facet diagrams from rough stone to finished cut, and much more!
Do I need to install anything?
No. GemDiagram runs entirely in your browser — no downloads or installs required.
What is the best-yield rough planner?
It fits your finished gem design inside a model of your rough stone so you can see the yield and waste before making a single cut.
Who is GemDiagram for?
Gem cutters of any experience level: from hobbyists using the guided creator to professionals planning custom cuts.
When does GemDiagram launch?
GemDiagram is launching in July 2026. Join the waitlist to be notified at launch.