by Kengo Ito·Modeling
Images © Kengo Ito. Used for product review; image policy.
Gemgen stands out in the superhive library for turning a cut selection and a few parameter tweaks into render-ready gem geometry, with jeweler-standard proportions built in per cut type in the Full edition.
Gemgen is a fully parametric gem generator for Blender. Pick a cut type, adjust parameters in real time, and get render-ready geometry. It comes in two editions: Lite covers the Round cut, and Full includes all ten cut types.
The Full edition's cuts are Round, Cushion, Emerald, Oval, Pear, Marquise, Heart, Trillion, Baguette, and Rose, each with optimized default proportions aligned with real-world gemstone standards. The mesh updates in real time as you edit parameters, and interactive viewport gizmos handle visual size and proportion editing. Set Good Proportions resets to jeweler-standard ratios with one click, an N-gon topology option is available for cleaner mesh output, and all parameters are animatable. The Full edition also includes a sample scene you can open and render.
Gemgen is a Blender add-on compatible with Blender 4.2 through 5.0, with Cycles listed as the render engine and released under the GPL license. Documentation and a demo video are available.
Gemgen - Parametric Gem Mesh Generator is best for jewelry designers creating product visualizations, 3D artists adding gems to scenes, game developers building gem assets, and motion graphics artists animating gem parameters.
Gemgen - Parametric Gem Mesh Generator is completely free to download and use.
Gemgen is compatible with Blender versions 4.2 through 5.0 and installs as a Blender add-on. It's listed as a Blender Extension, with Cycles noted as the render engine. If you're on a version within that 4.2 to 5.0 range, the add-on should load and run as expected. For versions outside that range, or to confirm the latest compatibility details, check the developer's page before installing.
Gemgen offers two editions with different cut coverage. The Full edition includes ten cut types: Round, Cushion, Emerald, Oval, Pear, Marquise, Heart, Trillion, Baguette, and Rose, each with optimized default proportions aligned with real-world gemstone standards. The Lite edition includes the Round cut only, while the other nine cuts require the Full edition. Every cut is parametric, so you can pick one and adjust its parameters in real time to reach render-ready geometry.
Gemgen is listed as free in this catalog. Licensing and edition details can change, and the plugin is offered in Lite and Full editions with different cut coverage, so check the developer's page for current terms before you download. The add-on is released under the GPL license. For the most accurate and up-to-date pricing or licensing information, the developer's page is the place to confirm what's included with each edition.
Gemgen makes all of its parameters animatable, so you can keyframe a gem's settings over time. The mesh updates in real time as you edit parameters, and interactive viewport gizmos let you adjust size and proportion visually. This suits motion graphics artists animating gem parameters, along with jewelry designers and 3D artists who want to change a gem's shape during a scene. The Full edition also includes a sample scene you can open and render.
Gemgen includes a Set Good Proportions feature that resets a gem to jeweler-standard ratios with one click. In the Full edition this is tuned per cut type, while the Lite edition tunes it for the Round cut. Each cut also ships with optimized default proportions aligned with real-world gemstone standards, so new gems start from realistic dimensions. You can then adjust parameters in real time and, if needed, use the one-click reset to return to standard ratios.
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