# Jewelry Maker Calc – Diamond Weight Estimator

> Jewelry Maker Calc – Diamond Weight Estimator is a paid API for AI agents from jewelry-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Estimates a diamond's carat weight from its millimetre dimensions and shape, or calculates the typical diameter of a round stone for a given carat weight.

## Facts

- Endpoint: GET https://jewelry-calc.x402tookit.com/diamond-weight?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/jewelry-maker-calc-diamond-weight-estimator-e16ca90a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iIkmF9K4lJ1-Ea7jPXbAL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability jewelry-maker-calc-diamond-weight-estimator-e16ca90a
```

Example prompt: What's the estimated carat weight of an oval diamond that's 10mm long and 7mm wide with a 63% depth?

## When to prefer this

Use this endpoint when you need a quick, formula-based estimate of a diamond's carat weight from its physical millimetre measurements (or vice versa) and do not have access to a gemological lab report. It supports eight common diamond shapes and allows custom depth percentages, making it more flexible than a simple lookup table. Prefer it over manual calculation or generic unit converters when building jewelry e-commerce tools, chatbots assisting buyers, or inventory cataloguing workflows.

## Known failure modes

- Missing both lengthMm and carats — endpoint requires at least one to compute; returns an error or empty result
- Invalid shape string — unrecognised shape values may fall back to round defaults or return an error
- widthMm required for non-round shapes but omitted — calculation may be inaccurate or fail
- Extreme or implausible dimension values may produce degraded=true results with a warning in reasons array
- Network or payment failure returns HTTP 402 or 5xx with no computation result

## How this service works

Estimate a diamond's carats from millimetre size and shape, or the diameter of a round stone for a given carat weight.

## Output

Returns estimated carat weight (and equivalent points and grams), plus the stone's computed dimensions (length, width, depth in mm and depth percent), the shape-specific formula factor used, a plain-English summary, and a disclaimer about the estimate being approximate.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "shape": {
       "type": "string",
       "description": "round, princess, oval, emerald, cushion, pear, marquise, heart (default round)"
      },
      "carats": {
       "type": "number",
       "description": "A carat weight, to get the typical round-stone diameter"
      },
      "widthMm": {
       "type": "number",
       "description": "Width in mm (defaults to the length; required for non-round shapes)"
      },
      "lengthMm": {
       "type": "number",
       "description": "Length (or diameter for round) in mm (use lengthMm or carats)"
      },
      "depthPercent": {
       "type": "number",
       "description": "Depth as a percent of width (default 61 for round, 65 for fancy shapes)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "shape": {
       "type": [
        "null",
        "string"
       ]
      },
      "factor": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "depthMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "widthMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "lengthMm": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/jewelry-maker-calc-diamond-weight-estimator-e16ca90a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from jewelry-calc.x402tookit.com](https://www.zero.xyz/host/jewelry-calc.x402tookit.com/llms.txt)