OpenFacet’s MCP server at (https://mcp.openfacet.net/) can be connected to ChatGPT as a plugin. This brings real-time, wholesale-backed natural diamond pricing benchmarks and shape-adjusted valuation models directly into your ChatGPT conversations.

Example Query

@OpenFacet I’m in a natural diamond shop, looking at a 1.48 carat elongated cushion, H VS1, ratio 1.3~1.35, the dealer offers ~5.5k USD, is this a good deal or should I negotiate? answer succinctly

ChatGPT Response with OpenFacet Plugin

OpenFacet’s live quote for 1.48 ct cushion, H, VS1, ratio ~1.325 is about $4,857 total (~$3,282/ct), with strong comparable supply.

At $5,500, you’re paying roughly 13% above that benchmark. I’d negotiate.

Target: ~$4,900–$5,200. $5,500 is acceptable only if the stone has excellent cut/light performance, no obvious bow-tie/crushed-ice issues, strong certificate, and the price includes meaningful retail services.

I’d open around $4,800–$4,900 and try to close near $5,000–$5,100.