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Preface

ProFacet was created for cutters who want to understand every facet of their craft. That vision led to FSL—a new faceting specification language shaped by Hackagem’s journey and refined through collaboration with expert designers and gem cutters.

Standard Faceting diagrams show you the result, but not the path to get there or how to adapt when things change. It’s like the difference between a photo of a cake and the recipe behind it. FSL gives you the recipe—the structure and freedom to recreate, adjust, and invent. Every feature in this handbook reflects that philosophy.

We are currently in a public preview. The core engine and the FSL language are considered stable, so no breaking changes are expected. Documentation, the printable diagram, UI polish, performance tuning, and smaller bug fixes are still being worked through, and your feedback accelerates that work.

The interactive slicer in ProFacet is your daily driver. Drag facets, adjust girdles, and watch the studio write FSL in real time. For most designs you never need to type a command, yet the language is always there when a peculiar cut or unconventional meet point demands it. That balance keeps experimentation fun without hiding the machinery that makes a stone reproducible.

When it is time to push performance, the Optimizer takes over. It speaks FSL natively, so you can tag any parameter and let the engine chase brightness, contrast, and scintillation using a modern metaheuristic evolutionary search. Under the hood, ultra-optimized GPU algorithms evaluate candidates faster than a human can pour water into a drip tank, but the controls stay simple: pick targets that matter, set sensible bounds, and let the system converge.

Timeline

  • Test Phase: now through 1 Mar 2026—iterate, gather feedback, and refine the tools and documentation while everything is still in flux.
  • Contest Window: 1 Mar – 1 May 2026—run the launch performance contest and keep the Hobbyist tier free so every cutter can participate.
  • Paid Phase: begins 1 May 2026—introduce billing for the Analyzer, Optimizer and Cloud Sync. The "offline" modus without these tools will stay free to use.

ProFacet is still in an early testing phase. Bugs, feature requests, questions, and general comments are welcome at https://github.com/mastercutter/ProFacet/issues; every report helps shape the launch roadmap.