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IDEX Diamond Pricing Intelligence
Two decades of data. A new era of intelligence.
20+
Years of verified diamond market dataDaily IDEX market data since 14 December 2005
IDEX brings more than twenty years of diamond market knowledge to a new generation of analytics, pricing tools and AI. Try Market Intelligence below: it is the real tool, on real IDEX data.
Scroll inside the tool to see every module. Listed asking prices, not transaction prices.tools.idexonline.com
20+ years of verified diamond market data
The IDEX market record.
Since 14 December 2005, IDEX has recorded the asking prices of the diamonds listed on its marketplace day by day, and its index compares the same grade with the same grade. Switch series on and off, choose a period, or pick a year below.
- First day
- 14 Dec 2005
- Monthly values shown
- 252
- Grades compared · 28 Oct 2026
- 8,929
- Diamonds listed with a price · 27 Oct 2026
- 894,508
Monthly values, 100 = 14 Dec 2005. Like-for-like listed asking prices per carat, not transaction prices. The last month is provisional (28 Oct 2026). Days missing from the IDEX archive, about 5% of the record, are IDEX estimates; the tools mark them. 28 Oct 2026: 8,929 grades · 888,545 matched stones · 97.7% coverage
Built on the record
Decades of market knowledge. A new generation of tools.
The same data runs from the first day of the record to the answer on your screen.
- The record · since 2005
20+ years of verified market data
The asking prices of the diamonds listed on IDEX, compared grade for grade, day by day. The foundation of every figure on this platform.
Explore the record - Market Intelligence · today, in context
Analytics across the whole history
The index, segment performance and the heatmap over any period back to 2005, with movers, supply and volatility for the recent market.
Market Intelligence - IDEX AI · in your own words
AI that answers from the record
The IDEX AI Analyst reads the same data, names the period and shows its tables. A figure it cannot check against the data is not shown.
How IDEX AI works
01 · Market Intelligence
Where the market moves, segment by segment.
One modular product for the whole listed market: from the headline index down to a shape, carat group and colour band, with the index and the heatmap reaching back to the start of the record. Every figure compares the same grade with the same grade, so a change in what is listed does not move it.
- Market TrendsThe IDEX Listed Diamond Price Index, the Performance Explorer and the Market heatmap
- Market MoversThe largest rises and falls, ranked by per cent or per carat
- Supply DepthHow many diamonds are listed on IDEX, by shape, size and grade
- Market VolatilityHow much a segment moves day to day, against the index
- IDEX AI AnalystQuestions about the market, answered from IDEX data
Market heatmap · Round · 30 days
| Carat | D–F | G–H | I–J | K–M | All |
|---|---|---|---|---|---|
| 0.50–0.69 ct | −2.3% | −1.0% | −0.1% | +0.4% | −1.6% |
| 0.70–0.89 ct | −1.6% | −1.2% | +1.4% | +0.3% | −1.1% |
| 0.90–0.99 ct | −1.8% | −1.6% | −0.2% | +1.4% | −1.2% |
| 1.00–1.49 ct | −2.0% | −1.1% | −0.2% | +0.8% | −1.3% |
| 1.50–1.99 ct | −2.0% | −1.3% | −0.7% | +0.5% | −1.3% |
| 2.00–2.49 ct | −0.1% | +0.3% | −1.2% | +0.4% | −0.2% |
| 2.50–2.99 ct | 0.0% | −0.9% | −1.5% | +0.9% | −0.5% |
| 3.00–3.49 ct | −0.7% | +0.2% | −1.0% | +0.4% | −0.4% |
| 3.50–3.99 ct | −0.1% | +1.3% | −0.1% | −1.2% | +0.1% |
| 4.00–4.99 ct | 0.0% | +1.2% | +0.2% | +0.4% | +0.5% |
| 5.00–5.99 ct | +0.6% | +1.8% | +0.4% | −0.1% | +0.9% |
02 · Diamond Pricing
Price any specification the way the market lists it.
Choose shape, carat, colour and clarity. IDEX returns the price per carat, today's range for that diamond and how its price moved, from one month to the full history wherever IDEX holds data for it. Try it: the tool on the right is live.
- Price LookupPrice per carat, today's low and high, and the indicative total
- Price MovementSeven periods from 1M to Max, estimated days marked
- Diamond ComparisonTwo diamonds side by side, the difference in per cent and amount
- Diamond Price MatrixEvery colour and clarity of one shape and weight in one grid
- Diamond ValuationA market-based value for one particular diamond, with its evidence and a report
Real IDEX data. The tool labels each figure for what it is.tools.idexonline.com
IDEX AI · in Market Intelligence
Ask the market a question. Get figures you can check.
The IDEX AI Analyst looks up the figures in IDEX market data, names the period and shows the tables it used. Every answer can open the matching view in the tool.
- Answers from IDEX data only. No figures from elsewhere, and it says when the data cannot answer.
- Listed asking prices. It states that its figures are asking prices, not transaction values.
- Market analysis, not advice. It does not forecast prices or tell you what to buy or sell.
IDEX AIMarket Intelligence AI AnalystVerified
Which diamond segments are gaining or losing value?
Cushion, 0.50–0.69 ct, I–J led the gains (+9.00%), while Princess, 0.70–0.89 ct, K–M led the declines (−8.47%).
These are the strongest movers by percentage across shape × carat group × colour band for 2026-09-28 to 2026-10-28. The 2026-10-28 snapshot is provisional.
Largest gains
| Rank | Segment | Change | Matched stones |
|---|---|---|---|
| 1 | Cushion · 0.50–0.69 ct · I–J | +9.00% | 295 |
| 2 | Pear · 5.00–5.99 ct · D–F | +3.88% | 97 |
| 3 | Oval · 4.00–4.99 ct · D–F | +3.45% | 109 |
Largest declines
| Rank | Segment | Change | Matched stones |
|---|---|---|---|
| 1 | Princess · 0.70–0.89 ct · K–M | −8.47% | 171 |
| 2 | Cushion · 0.50–0.69 ct · D–F | −8.22% | 1,969 |
| 3 | Princess · 0.70–0.89 ct · I–J | −7.22% | 1,293 |
Changes measure like-for-like listed asking prices per carat, not transaction values. Segments with insufficient observations or coverage are excluded from the rankings.
What are the most important market changes this month?
03 · Pricing Advisor
Your inventory, checked against the market.
An application in the Retailer Hub for retailers: it recommends selling prices from IDEX market data and your pricing policy, shows your margin on every stone, and reprices a whole inventory for you to review. Nothing changes until you approve and export it.
- Pricing RecommendationsA recommended price for one stone, with the market evidence
- Margin AnalysisGross margin and markup, break-even and minimum price
- Inventory RepricingImport your stock, review the proposals, export the approved prices
- Import
Your inventory as a CSV file
- Reprice
Against IDEX market data and your policy
- Review
Every proposal with its margin
- Approve
The prices you accept
- Export
A file for your own systems
Approval only marks a price as ready for export. IDEX sends nothing anywhere.
Where you use it
In your workspace, on your website, in your systems.
One set of IDEX market data behind every channel: a figure means the same in the Hub, on your website and in the API.
On your own website
Market Intelligence and the Diamond Pricing tools run on your own website with the embed code the Hub gives you, styled to your brand in the Widget Designer.
<!-- embed code from the Retailer Hub --> <script async src="https://tools.idexonline.com/idex-tools.js"></script> <idex-diamond-pricing deployment-id="dep_…"></idex-diamond-pricing>
In your own systems
Prices, history and market figures in your own systems over the documented REST API of the IDEX Data Platform, with an API Explorer in the Hub.
GET data.idexonline.com/v1/pricing/quote
?shape=round&carat=1.00&color=G&clarity=VS2 Who it's for
Built for the professionals who price diamonds every day.
Retailers and jewellers
Price with confidence at the counter and online.
- Check a stone before you quote
- Reprice your inventory against the market
- Put pricing tools on your own website
Suppliers and traders
Know where your goods sit against the listed market.
- Compare specifications side by side
- Follow the segments that move
- See listed supply by shape and size
Manufacturers
Read the market before and after the cut.
- Price grids per shape and weight
- Long-term movement since 2005
- Volatility by segment
Valuers and insurers
A market reference with the method shown.
- Prices on any past market day
- A range, not only an average
- Estimated days clearly marked
Why IDEX
Depth, trust and a modern platform.
Decades of trusted market knowledge, combined with a new generation of technology.
Historical depth
More than two decades of diamond market data, recorded day by day since December 2005, so today's prices can be read against the market's long-term cycles.
Trust and reliability
Verified market information from IDEX, labelled for what it is. Asking prices are called asking prices, today's figures are marked provisional, estimates are shown as estimates, and the method is published.
Modern intelligence
Analytics, pricing tools and AI built on that foundation, in the Retailer Hub, on your website and through the API. One source of data, so a figure means the same thing everywhere.
Get Access
Bring IDEX market intelligence to your business.
Tell us about your company. IDEX reviews every request and replies by email. Approved companies choose their products inside the IDEX Retailer Hub.
01Request access with your company details
02Confirm your email address
03IDEX reviews your request by hand
04Sign in to the Retailer Hub and choose your products