# Gem

> Sheen pack: a dodecahedron of clear glass caught halfway between cut and molten. Its faces slowly sag and lift, so the edges sharpen and soften as it turns, and each facet throws the colored studio light back in a different hue under a soap-thin iridescent film. A tap melts it soft and lets it set again. Raymarched in WebGL.

- Slug: `sheen-gem`
- Category: [Asset packs](https://www.assembli.design/category/asset-packs.md)
- Subcategory: [Sheen](https://www.assembli.design/category/asset-packs/sheen.md) (`sheen`)
- Type: component
- Tags: 3d, webgl, raymarching, asset, glass, iridescent, gem, crystal, dodecahedron, polyhedron, molten
- npm dependencies: none
- shadcn/ui dependencies: none
- Added: 2026-10-25
- Live preview: https://www.assembli.design/preview/sheen-gem
- Page: https://www.assembli.design/components/sheen-gem

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/sheen-gem/sheen-gem.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/sheen-gem
```

Registry item JSON: https://www.assembli.design/r/sheen-gem.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.