Design library

The public library is intentionally empty. Designs from the local 1,151-file corpus are not redistributable without per-designer license clearance.

About Studio

PNWCX Studio is a browser-native faceting design tool. Open .gem · .gcs · .asc files, see them rendered as transmissive 3D gems, step through the cutting order, export to .asc · .stl · .obj · .png or print a cutter sheet. No install, no native dependencies.

V1 features

• Viewer: physical-material 3D render with real refractive index, dispersion, transmission, and clearcoat. Four GCS lighting models (Studio, Random, Angle Rings, Cosine, Isometric). Iso / Crown / Pavilion / Profile camera presets — Profile is a true 2D side cross-section.
• Materials: 32-entry database with real RI, dispersion, density, hardness, critical angle, and per-species body color sourced from GIA / Webster / Gemdat references.
• Render properties: live sliders for color, clarity, density, RI, dispersion, exposure, background. Tilt the stone X/Y to inspect off-axis behavior.
• Tier inspector: click any tier row or 3D facet to highlight it. Per-tier show / hide / isolate. Index gear ring around the top-down view.
• Cutting Assistant: step through the cutting sequence (pavilion → girdle → crown), see tiers progressively appear.
• Editing: undo / redo with keyboard shortcuts, rotate by gear teeth, flip crown↔pavilion, resize girdle.
• Mast + CUT: live mast controls in the ruler bar (angle / index / depth / tier). Drag the depth slider to see the cutting plane preview update in 3D, then hit CUT (or Ctrl+Enter) to apply it. Symmetry + mirror replicate the cut around Z. Start from scratch with the Preform button (unit cube hull).
• Library: sample designs bundled, plus your own local folder via the File System Access API (Chromium) or multi-file picker - IndexedDB cache makes re-opening instant.
• Yield calculator: dial in the stone's real-world width, pick a material, get L/W and T/W ratios + estimated carat weight.
• Export: .asc round-trip, .stl + .obj for 3D printing or external tools, .png screenshot, printable cutter sheet.

Roadmap

• Phase 0.5: iPhone color matching — point your phone at the rough, see the cut in that exact color.
• Phase 1: spectral ray tracer — real fire, birefringence, brilliance metrics that match BOG / DiamCalc.
• Phase 2: geometry editor — Add Facet, Add Meet, tangent-ratio scaling, meet-point validator.
• Phase 3: ML design suggestion + photogrammetric rough fitting (build the 3D model from phone photos).
• Phase 4: design marketplace integrated with PNWCX rough sales.

Built on

Studio reads and writes GemCad .gem/.asc and GemCutStudio .gcs files, so cutters can keep the libraries and the tools they already know. Free to use - the CAD editor, all three file formats, the cut sheet, and the full optics engine: brilliance, light path, spectral raytrace, tilt performance and the Manual Optimizer.

Built by a cutter, for cutters. It is free while we build version 2, and the fastest way to shape it is Help ▸ Send feedback.

About your results

Studio shows you what a design could look like before you cut it. Rough has its own opinions - hardness runs differently through a stone, cleavage is real, and a piece can fight you or break outright. No plan survives every stone, and no software or machine can tell you otherwise. Check the numbers against your own machine, and trust your hands.

The angles, index settings and cut order are arithmetic - those we intend to be right, and you can check them. The renders are a different thing. They assume one clean refractive index and an even body colour. Your stone has neither: RI shifts with composition, doubly refractive material changes with how the cut sits to the axes, colour zones absorb unevenly, and silk and strain scatter light no model sees. Short of putting your piece on a refractometer and testing what is actually in it, the numbers behind a render are estimates. Treat it as one possibility, not a preview. That holds for paid features too - paying for a tool does not turn an estimate into a promise.

Nothing here makes you cut anything. You pick the rough, the machine, the laps and the moment, and you can walk away at any point. The cutter decides, and the cutter is responsible. That is the job.