{"uid":"cap_iIkmF9K4lJ1-Ea7jPXbAL","slug":"jewelry-maker-calc-diamond-weight-estimator-e16ca90a","name":"Jewelry Maker Calc – Diamond Weight Estimator","description":"Estimate a diamond's carats from millimetre size and shape, or the diameter of a round stone for a given carat weight.","url":"https://jewelry-calc.x402tookit.com/diamond-weight?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"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","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"depthPercent":{"type":["null","number"]},"estimatedGrams":{"type":["null","number"]},"estimatedCarats":{"type":["null","number"]},"estimatedPoints":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_aJOW5hwrki6wQ9xtf5v4A","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"What's the estimated carat weight of an oval diamond that's 10mm long and 7mm wide with a 63% depth?","exampleUseCases":[{"title":"Identify stone weight from measurements","prompt":"I have a round diamond that measures 6.5mm across — can you estimate how many carats it is, assuming a standard 61% depth?"},{"title":"Find diameter for target carat weight","prompt":"I want to set a 1.5 carat round solitaire — what diameter in mm should I expect the stone to be?"},{"title":"Estimate fancy-cut diamond weight","prompt":"I'm buying a marquise diamond that's 12mm long and 6mm wide with a 65% depth — what's the estimated carat weight?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:15:02.861Z","isFirstParty":false,"canonicalSlug":"jewelry-maker-calc-diamond-weight-estimator-e16ca90a"}