# Altın Kemer Kuyumculuk — credits and licences

A demo by Olympos Web for a fictional brand. Every asset below is self-hosted in this folder or in `../shared/vendor/`.

## Environment light
- **Studio Small 09** HDRI, 1k `.hdr` — Sergej Majboroda, Poly Haven. CC0.
  https://polyhaven.com/a/studio_small_09 · file `img/studio_small_09_1k.hdr` (md5 d5d7eb9d26d341d6aa4d11c1a54fd97c)

## Fonts (SIL Open Font License 1.1; licence texts beside the files in `fonts/`)
- **Young Serif** — The Young Serif Project Authors (noirblancrouge). `fonts/OFL-youngserif.txt`
- **Hanken Grotesk** (variable) — The Hanken Grotesk Project Authors (marcologous). `fonts/OFL-hankengrotesk.txt`
- **Marcellus** — Brian J. Bonislawsky, Astigmatic. `fonts/OFL-marcellus.txt` (engraving preview only)
- **Pinyon Script** — The Pinyon Project Authors (SorkinType). `fonts/OFL-pinyonscript.txt` (engraving preview only)
Latin and latin-ext woff2 subsets from Google Fonts; licence files from github.com/google/fonts.

## Libraries (`../shared/vendor/`, licences beside them)
- three.js r180 (MIT) — the ring, the faceted gem and the casting sequence are procedural geometry written for this page.
- GSAP 3.13 with ScrollTrigger and DrawSVGPlugin (GSAP standard licence, free).
- Lenis 1.3 (MIT).

## Drawn and generated media
- No photographs, no AI-generated imagery. The ring, gem, wax tree and flask are procedural 3D; the technical
  drawing, cross-sections, stone outlines, stage diagrams and engraving strip are SVG geometry drawn for this page.

## Facts used
- Ring numbering: the page uses number ≈ inner circumference (mm) − 40, the relationship followed by the whole-mm
  rows of a Turkish jeweller's "Türk standardına göre" table (atelierduygu.com/en/pages/yuzuk-olcu-rehberi,
  read 2026-10-22). No official standard document was found; the page says jewellers can differ by half a size.
- Card width 85.60 mm: ISO/IEC 7810 ID-1.
- Karat fineness 585 / 750 / 916 (parts per thousand of 14, 18, 22 of 24).
- Alloy densities used for the example weight: 14 k ≈ 13.1, 18 k ≈ 15.6, 22 k ≈ 17.7 g/cm³ (approximate yellow-gold
  values; labelled "örnek hesap" on the page).