The classic 57-facet diamond cut Marcel Tolkowsky published in 1919 — geometry tuned to maximize the return of light through the crown. Every modern engagement-ring brilliant traces back to this paper. Designed for diamond's 2.42 IOR; performs well on sapphire, ruby, CZ, moissanite with matched proportions.
57 facets (table, 8 bezel + 8 star + 16 upper-girdle on the crown, 16 lower-girdle + 8 pavilion on the pavilion); a 58th culet facet historically added on small diamonds to protect the point. Tolkowsky-ideal proportions: table 53%, crown angle 34.5°, pavilion angle 40.75°, depth 59.3%, polish + symmetry Excellent. AGS / GIA grade cut on optical-performance and proportions. Other diamond facet families: princess (square brilliant, 49–58 facets), emerald (step cut, 50 facets, mirror staircase), Asscher (square step), oval / pear / marquise / heart (modified brilliants).
character — fire (spectral splash) and brilliance (white return) at full design IOR; bright, glassy, faceted.
GIA Diamond Grading and Identification literature; AGS American Gem Society cut-grading standards.
House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, applications, and finishes — equal weight, citable everywhere, so a student can move from "what is this" toward "what's actually buildable here, now, by me." Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway, Lefteri, Forty, Sparke, ASM, GIA. Every voice: Voices.
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