Updated from live inventory
Lab-grown diamond price index
Follow comparable one-, two-, and three-carat prices over time and download the underlying data or chart.
Read moreResearch and data
Lab-grown diamond research and data
Our strongest work is research that another shopper, journalist, or analyst can inspect and use. This hub brings together our live price tracking, real-order experience, and the methods behind our conclusions.
Start here
Our most useful starting points
Based on real purchases
Buying, shipping, and returns benchmark
Compare what happened in our real orders at six jewelers, including four completed return tests.
Read moreCurrent diamonds
Live diamond finder
Search current jeweler inventory by shape, carat weight, budget, and buying priority.
Read moreUnderstand our evidence
Our recommendations combine firsthand purchases and inspections with repeatable price research, current policy checks, and clearly attributed external evidence.
Editorial review process
How we research, update, score, disclose, and correct our reviews and buying guides.
Our diamond experts
Meet the people responsible for the site’s diamond research, testing, and editorial decisions.
Complete price research library
Browse our price guides by carat weight and put loose-diamond prices into a complete jewelry budget.
Use and cite our research
Each research report states its method, date, scope, and limits. Reuse the public data with a link to the source report and the applicable market-check date.
CSV
Download the price-index CSV
A versioned table of dated market benchmarks, coverage, and qualifying inventory counts.
SVG
Download the price-index chart
A self-contained SVG chart with source, date range, and dataset version embedded in the file.
JSON
View the price-index JSON
The same market series in a machine-readable format for developers and data analysis.