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Each design targets a specific outline shape — round, oval, marquise, pear, kite, lozenge, cushion, and classic polygons. The shape filter lets you narrow results to the exact silhouette you want to cut.
Shapes also have variants: truncated (corners clipped for durability), mirrored (symmetric left-to-right), and cushioned (softened corners). Expand the "Variants" section to filter by these modifiers.
Because outline geometry affects how light interacts with the pavilion, each shape has its own performance envelope. A brilliant round and an elongated marquise face very different optical challenges — so comparing scores across shapes is most meaningful within the same category.
The Refractive Index (RI) describes how much a gem material bends light. Every mineral has a characteristic RI — for example quartz is 1.54, topaz 1.62, sapphire 1.77, and diamond 2.42.
A faceting design that performs brilliantly at one RI may be mediocre at another, because the critical angle for total internal reflection changes with the material. That is why each design in the store is optimized for a specific RI.
Select the RI that matches your rough material so you only see designs purpose-built for that stone. If you are unsure, check the gem material's RI in any mineralogy reference.
Brightness measures the total light returned to the observer, normalized against a Hearts & Arrows reference. Values above 1.0 outperform the benchmark.
In gemstone optics, brightness and contrast are fundamentally in tension. A design that maximizes total light return can easily produce a "watery" stone with almost no visible pattern. Conversely, pushing contrast too hard may sacrifice light return.
The best designs live in the upper-right of a brightness-vs-contrast plot: high light return and strong alternating light–dark patterning — what the human eye perceives as "life" and "fire".
Use this range slider to set a minimum brightness threshold and filter out designs that fall below your requirements.
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Cut & Sell Finished Stones Freely: Your purchase unlocks permanent access to the printable PDF cutting diagram and 3D FSL file. You may cut stones for your own collection, gifts, or to sell finished gemstones faceted in your workshop.
Please do not republish, redistribute, or resell the digital diagram or FSL file itself. Optional Customer Optical Performance Certificates can be generated anytime for stones you sell.
You will be securely redirected to our payment partner, Creem, to finalize your purchase. We do not store your payment information.
Permanent Access & Workshop License: Your monthly free claim unlocks permanent access to the full printable PDF cutting diagram and 3D FSL file — cut stones freely in your workshop for personal collections, gifts, or sale.
Please do not republish, redistribute, or resell the digital cutting diagram itself. Optional Customer Optical Performance Certificates can be added anytime.
You can claim one free design per calendar month. This uses your claim for the current month and adds the PDF & FSL files to My Collection forever.