A rectangular cut with stepped parallel facets descending the crown and pavilion like a staircase, large open table, cropped corners. Reads as architectural — the gem's color and clarity show through rather than splashing fire. Originally cut for emeralds (which crack easily under brilliant-cut pressure); now standard for high-color rubies, sapphires, aquamarines, and many fancy diamonds. The cut Phil's classroom would call 'editorial.'
50 facets typical: table, 8 crown step facets in 3 levels (8 + 8 + 8), 8 pavilion step facets in 3 levels, 8 culet step facets, 4 cropped corners. No upper / lower girdle facets like a brilliant. Aspect ratio 1.30–1.50 length-to-width is classical; 1.0 length-to-width with 90° corners is the related Asscher cut. Emerald's stepped facets reveal inclusions — only high-clarity material is suitable; any inclusion telegraphs through the open table. Optimum depth 60–70% (deeper than brilliant); preserves crystal weight better than brilliant on prismatic rough. The 'hall of mirrors' visual character: long flashes rather than spangle.
character — architectural rectangle, hall-of-mirrors flash, color-revealing, demands clarity.
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, with cost-over-volume curves, trade-off profiles, equipment-tier filters, and second-life paths layered onto the data 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's Material World on raw materials, Lefteri's Making It on processes, Forty's Concrete and Culture, Sparke's Design in Context, Bürdek's Design: History, Theory and Practice of Product Design, Schröpfer's Material Design on materials in architecture, Winchester's The Perfectionists on tolerance, Minshall's Your Life Is Manufactured on the global supply chain, von Busch's Making Trouble on material activism, Were's How Materials Matter, Hegger / Drexler / Zeumer's Basics Materials, Untracht and McCreight on metalsmithing, USDA Forest Products Lab on woods, GIA on gemstones, Schott / CoorsTek / Toray / Owens Corning datasheets, MakeItFrom for verifiable property numbers, ASM Handbook, ISO standards. Museum holdings draw from the Met, MAD, V&A, Smithsonian American Art Museum, Newark Museum of Art, British Museum, Heard Museum, Smithsonian NMAI, Eiteljorg Museum, Philadelphia Museum of Art, Cranbrook Art Museum, and Grand Rapids Art Museum — collection-record permalinks only, designer overview pages and exhibition listings excluded. Voice blocks now ride on every entry kind — material, process, application, and finish — and include Ruskin on iron, Anni Albers on twining, Greg Lynn on the shred-and-teeth NURBS lineage, Pugin on the metal that won't be hammered, Barthes / Yanagi / Benjamin channeled within their philosophy; Sparke, Bürdek, Forty, Conway, Schröpfer, Minshall, von Busch, Lefteri, Pat Pruitt, Mary Lee Hu, Tom Joyce, Albert Paley, and the rest of the contemporary makers quoted verbatim with citation. All cited.
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