# Arete Diamond

> Retail e-commerce for certified loose diamonds (GIA/IGI/HRD) and made-to-order
> fine jewellery, based in Prague, Czech Republic, serving the EU. Prices are
> retail and VAT-aware; loose diamonds are procured per order (backorder with a
> stated delivery time), jewellery is made to order. Checkout is always completed
> by a human — agents hand off a secure checkout link and never take payment.

Start here: [Agent landing page](https://aretediamond.cz/ai) · [Agent authentication](https://aretediamond.cz/auth.md)

## Machine interfaces

- [MCP endpoint](https://aretediamond.cz/mcp): Model Context Protocol server (Streamable HTTP, JSON-RPC) — 15 read-mostly tools for diamond search, jewellery configuration, pricing, education and checkout hand-off
- [MCP server card](https://aretediamond.cz/.well-known/mcp/server-card.json): endpoint + capabilities descriptor
- [A2A agent card](https://aretediamond.cz/.well-known/agent-card.json): Agent2Agent card mapping the MCP tools to skills (legacy alias: https://aretediamond.cz/.well-known/agent.json)
- [Agent-skills index](https://aretediamond.cz/.well-known/agent-skills/index.json): Agent Skills discovery index (SKILL.md with sha256 digest)
- [API catalog](https://aretediamond.cz/.well-known/api-catalog): RFC 9727 linkset — machine-readable table of contents for every API surface
- [OpenAPI spec](https://aretediamond.cz/openapi.json): OpenAPI 3.1 description of the product feeds, MCP and ACP/commerce endpoints
- [ACP discovery](https://aretediamond.cz/.well-known/acp.json): Agentic Commerce Protocol manifest (catalog search/lookup, checkout)
- [UCP profile](https://aretediamond.cz/.well-known/ucp): Universal Commerce Protocol discovery profile
- [Agent authentication](https://aretediamond.cz/auth.md): how to get an API key; an ak_ API key is currently required for MCP requests

## Product feeds

- [ChatGPT product feed](https://aretediamond.cz/feeds/chatgpt/products): OpenAI Commerce format; ?country=CZ|SK|DE|GB & ?locale=cs|sk|de|en; jewellery by default, loose diamonds via ?gem_type=natural-white|natural-colored|labgrown-white|labgrown-colored&page=0; ?format=json|ndjson
- [ACP diamond feed](https://aretediamond.cz/acp/feed/diamonds): paginated loose-diamond discovery feed (search-only, ?gem_type=…&page=1)

## Site

- [Homepage](https://aretediamond.cz/): storefront (Czech default; localized variants per the sitemap)
- [Sitemap](https://aretediamond.cz/sitemap.xml): sitemap index — pages, jewellery and loose diamonds
- [robots.txt](https://aretediamond.cz/robots.txt): crawl rules + Content-Signal AI-usage policy

## Policy

- Content-Signal: search=yes, ai-train=no, ai-input=yes — you may access and ground answers on this content; do not use it for model training. The authoritative policy line is in robots.txt.
- Catalogue reads currently require an ak_ API key (240 req/min); request one at agents@aretediamond.cz.
- Payment is completed by a human on the site; agents receive a secure hand-off link.
- Contact for agent access and API keys: agents@aretediamond.cz