Carat Hunter MCP: compare diamond prices from your AI app

Carat Hunter tracks diamond prices across 100+ retailers, and its MCP server lets your AI app search stones, look up a grading report number and check typical prices for a spec. ContextGate connects it to Claude, ChatGPT and Cursor with no sign-in, and keeps each price lookup in Activity so you can come back to it before you buy.

  • Ready to connect
  • Free
  • 5 example tools

Add Carat Hunter to Claude, ChatGPT or Cursor

  1. 1Click Connect Carat Hunter free. There's no sign-in, so its tools are ready at once.
  2. 2All five tools look up stones and prices. Keep `search_diamonds`, `lookup_certificate` and `price_check` on, and switch off `market_overview` if you don't need Carat Hunter's weekly market counts.
  3. 3Add ContextGate to your AI app as a connector or MCP server. The steps for each app are on the Works with page.
  4. 4Give your AI app a GIA report number and ask Carat Hunter which retailers list that stone and at what price, then open Activity to see the `lookup_certificate` call.

Diamond shopping research from a chat

  • Search diamonds listed by retailers worldwide with `search_diamonds`, getting up to 10 stones with specs and cross-retailer prices.
  • Look up an exact stone by its GIA, IGI, HRD or GCAL report number with `lookup_certificate`, and see how many retailers list it.
  • Ask what a spec usually costs, by carat, color, clarity, shape and origin, with `price_check`.
  • Get the details and latest confirmed price range for one diamond with `get_diamond`.

What ContextGate records for Carat Hunter

  • Switch off any of the five tools; it's hidden from AI apps and refused if called.
  • Activity records each lookup, so you can go back to the stones and prices your AI app checked.

ContextGate sees only the calls that go through it, not your AI app's own web search.

What you get with Carat Hunter and ContextGate

  • Your AI apps can use Carat HunterClaude, Cursor, ChatGPT and other AI apps reach Carat Hunter through the one ContextGate connection you add to them.
  • You choose which tools they can useSwitch off any Carat Hunter tool you don't want used. It's hidden from your AI apps and refused if called.
  • Every call is checked and recordedYour policies check each call (for example, personal data is hidden and secrets are blocked), and Activity keeps a record of it.

ContextGate sees only the tool calls that go through it, not your AI app's built-in tools or your chats.

Carat Hunter tools

Examples of what your AI apps can do in Carat Hunter. You'll see the exact list of tools after you connect it.