Estimated carat of a round brilliant

Code snippets

curl "https://api.oanor.com/gemstone-api/v1/round-brilliant-weight" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/gemstone-api/v1/round-brilliant-weight", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/gemstone-api/v1/round-brilliant-weight");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/gemstone-api/v1/round-brilliant-weight",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "When a stone is set and cannot be weighed, the trade estimates a round brilliant's weight from its measurements: carat ≈ diameter² × depth × 0.0061, with the diameter and depth in millimetres. A 6.5 mm round about 4 mm deep estimates near 1 carat — which is why a 1 ct round brilliant is roughly 6.5 mm across. Adjust the factor for a thick girdle or different cut; it is an estimate, not a substitute for a scale.",
        "inputs": {
            "factor": 0.0061,
            "depth_mm": 4,
            "diameter_mm": 6.5
        },
        "estimated_carat": 1.0309,
        "estimated_grams": 0.20618,
        "estimated_points": 103.09
    },
    "meta": {
        "timestamp": "2026-06-07T08:17:54.332Z",
        "request_id": "f9fe03c4-8a0c-415b-9f1c-6b079e276b45"
    },
    "status": "ok",
    "message": "Round brilliant weight",
    "success": true
}