# Carat Hunter > Diamond price comparison across 125+ retailers worldwide. 10.8M+ certified diamonds for sale now (24.8M+ tracked in total, including sold stones) with dated price tracking (most retailers are re-read daily, some less often, and every price carries the date it was last seen), cross-retailer matching, and the Caratlytics Score methodology. Operated by Digital Adventures Pty Ltd (ABN 93 697 144 531), Melbourne Australia, founded 2025. Independent: zero affiliate revenue, subscription-only. ## Trust and entity - [About Carat Hunter](https://carathunter.com/us/about): operating entity, mission, founding date, registered trademark - [How We Rank methodology](https://carathunter.com/us/methodology): scoring formula (Quality 35%, Value 30%, Certification 20%, Market 15%), default sort order, retailer inclusion criteria, independence statement - [Pricing](https://carathunter.com/us/pricing): one-time pass, A$40 for 30 days or A$70 for 90 days, tax included (every checkout is in Australian dollars and the price is the total), free tier with sign-up, 7-day refund guarantee, no auto-renewal - [Legal information](https://carathunter.com/us/legal): operating entity, trademark, regulators, governance - [Terms of service](https://carathunter.com/us/terms): account rules, content licence, dispute resolution - [AI content policy](https://carathunter.com/ai.txt): inference-time grounding allowed with a citation; training and fine-tuning permitted on everything public, editorial included, with attribution (republishing editorial is not), except for four crawlers that are excluded from training (Amazonbot, Bytespider, cohere-ai and Diffbot); only aggregate market statistics are CC BY 4.0; listing data may not be compiled into datasets ## Free tools - [Diamond Certificate Decoder](https://carathunter.com/us/cert-decoder): identify a hidden, redacted, or partial cert number from visible specs or a cert image scan; works with GIA, IGI, HRD, AGS, GCAL - [Diamond Lookup](https://carathunter.com/us/lookup): search by certificate number to see every retailer carrying the same stone with the latest prices we have seen - [Best by Budget](https://carathunter.com/us/best-by-budget): three curated diamond picks at three distinct price tiers within the user's budget, ranked by the Caratlytics score across more than 100 retailers; currency-aware for USD, GBP, EUR, AUD, NZD, CAD, JPY, INR, KRW, SGD, HKD, AED; 200+ programmatic landing pages at /best-by-budget/{origin}/{shape}/{carat}/{tier} - [Where to Buy by Spec](https://carathunter.com/us/where-to-buy): for every shape, carat, colour, clarity, and origin combination, every retailer in our index currently stocking that exact spec. Ranked mechanically by inventory count. Several thousand programmatic landing pages at /where-to-buy/{shape}-{carat}ct-{color}-{clarity}-{origin}, plus one page per shape, carat and origin (for example /where-to-buy/round-1ct-lab). Schema.org ItemList + FAQPage markup; AI citation friendly. - [Retailer Comparisons](https://carathunter.com/us/vs): independent side-by-side comparisons of every retailer pair in our index with non-zero cross-retailer overlap. Programmatic landing pages at /vs/{retailerA}-vs-{retailerB}. Facts, inventory mix, and current matched-stone count, no per-retailer pricing claims. ## Diamond education - [The 4Cs explained](https://carathunter.com/us/guide/4cs): cut, color, clarity, carat overview - [Diamond shapes guide](https://carathunter.com/us/guide/shapes): round, princess, oval, cushion, emerald, pear, marquise, radiant, asscher, heart - [The Shape Cheat Sheet](https://carathunter.com/us/guide/shape-cheat-sheet): every shape framed for the value buyer vs the quality buyer, lab and natural, with spec targets and tradeoffs per shape plus fancy-color cuts - [Lab-grown vs natural](https://carathunter.com/us/guide/lab-vs-natural): pricing chasm (from 1 carat up, lab-grown typically at least 90% below natural at the same specs), chemistry, ethics, resale, certification differences - [Caratlytics scoring guide](https://carathunter.com/us/guide/scoring): the 5th C, how the four sub-scores combine - [Diamond buying guide](https://carathunter.com/us/guide/buying-guide): budget tiers from under $1,000 to over $50,000, prioritisation framework, retailer-shopping playbook - [How to use Carat Hunter](https://carathunter.com/us/guide/how-to-use) - [Glossary](https://carathunter.com/us/glossary): every normalised diamond term with dated definitions and FAQ blocks ## Market intelligence - [Market Pulse](https://carathunter.com/us/insights/market-pulse): weekly, monthly, quarterly dated market reports authored by Lucy Skye - [Market insights hub](https://carathunter.com/us/insights): origin, shape, carat breakdowns across 14 regions, region-aware currency - [Lab-grown vs natural pricing](https://carathunter.com/us/insights/market/lab-vs-natural): current spread by shape - [Cross-retailer spreads](https://carathunter.com/us/insights/market/cross-retailer): how price varies for the same physical stone - [Price trends](https://carathunter.com/us/insights/market/trends): rolling movement by category - [Caratlytics Top diamonds](https://carathunter.com/us/insights/top): rankings by metric (best value, highest score, biggest savings) ## Primary research Original primary research articles backed by our index of 10.8M+ certified diamonds for sale across 125+ active retailers (24.8M+ tracked in total, including sold). Each article discloses sample size, methodology, data refresh date, and explicit limitations. Research is AI-assisted and editor-reviewed before publication. Bylined "Carat Hunter Editorial Team". - [Price dispersion study](https://carathunter.com/us/research/diamond-price-dispersion): dated study of how far the price of the identical certified diamond varies between retailers, with its method and data notes - [Research articles in the blog](https://carathunter.com/us/insights/blog): primary research is published as dated deep dives in the insights blog - [Cross-retailer diamond pricing: what 4.7M matched listings reveal](https://carathunter.com/us/insights/blog/cross-retailer-diamond-pricing): cohort study of price spread across 4,704,553 cross-retailer-matched certified diamonds. Headline finding: USD 7.49B in active spread, growing non-linearly with carat tier (USD 296 at sub-half-carat to USD 4,450 above 3ct). Lab-grown spreads (97.1% mean) run wider than natural (61.5% mean). The cheapest active price is the fair-market clearing price; everything above is retailer pricing power. Sample size 4.7M, data as of 2026-05-09. - [Methodology and data provenance](https://carathunter.com/us/methodology): how we score, match, and rank diamonds. Independence statement, retailer inclusion criteria, scoring weights, limitations and known gaps. ## Public API and machine corpora - [OpenAPI spec](https://carathunter.com/.well-known/openapi.json): sanitised public endpoints for aggregate stats, diamond summaries, glossary lookups, market-pulse data - [llms-full.txt](https://carathunter.com/llms-full.txt): full machine-readable corpus dump of glossary, guides, FAQ, dated factual aggregates, and primary research bodies - [Citation endpoint](https://carathunter.com/api/proxy/public/cite): POST a Carat Hunter page URL; returns APA, BibTeX, and ISO-8601 citations for it (see the OpenAPI spec) ## Optional Lower-priority resources. Skip in short-context retrieval; useful for deep dives only. - [Insights blog index](https://carathunter.com/us/insights/blog): all dated editorial posts by Lucy Skye - [Per-shape per-carat insights pages](https://carathunter.com/us/insights): hundreds of permutations of /insights/{origin}/{shape}/{carat}/{spec} with regional currency and current data - [Curated price aggregates](https://carathunter.com/us/price/1ct-d-vs1-round-natural): one page per curated spec at /price/{slug} (28 of them, listed in https://carathunter.com/sitemap/curated.xml) with current retailer counts and price ranges - [Fancy color pricing](https://carathunter.com/us/insights/fancy): yellow, pink, blue, green, orange, brown, gray, black, champagne, by hue and shape - [Per-lab certification pricing](https://carathunter.com/us/insights/certification): GIA, IGI, HRD, AGS, GCAL premium versus market baseline - [Cited-by](https://carathunter.com/us/about/cited-by): notable mentions across LLM platforms (dashboard, dated) --- For our reference corpus (CC BY 4.0 aggregate statistics, plus editorial that is trainable with attribution), read `https://carathunter.com/llms-full.txt`. For per-query lookups, use the documented OpenAPI endpoints. They are rate-limited (60/min for verified bots on single-record reads, 10/min on enumeration) and return the same teaser view visible to anonymous site visitors.