ABOUT FACET
Diamond prices,
held up to the light.
DiamondTheGuide is a free guide for diamond prices. Pick a shape, a size and two grades, and see what that stone is listed for, how the price has moved, and how natural compares with lab-grown — with every number showing where it came from.
What DiamondTheGuide is for
Explore by specification
Shape, carat, color and clarity drive a diamond's price. DiamondTheGuide lets you move through them freely — the chart, the color × clarity matrix and the stone illustration all follow your choice.
Natural and lab-grown, never blended
They look the same but behave as two different markets. We always show them as separate, clearly labeled series — side by side, never averaged into one number.
Learn while you look
What does VS1 mean? Why does a 1.00 ct stone cost more per carat than a 0.90? Short explanations sit next to the data, and the illustration shows what each grade changes.
How we read the market
Once a day we take a snapshot of diamonds listed for sale, clean it, and turn it into prices you can compare. Raw listings never leave our build — you only see the results.
Full methodology →Collect
A daily snapshot of diamonds listed for sale by our data partner.
Deduplicate
The same stone listed by several sellers is counted once, matched by its grading report number.
Filter
Treated stones, stones without a report, and extreme outliers are set aside.
Summarise
For each shape, size bracket, color and clarity we take the median price per carat and its spread.
Publish
Results are published with their date and listing count. Natural and lab-grown are kept apart.
What our numbers are — and aren't
THEY ARE
- Median asking prices from diamond listings
- Calculated per exact specification — shape, size bracket, color, clarity and grading lab
- Shown with the number of listings behind them and the date of the snapshot
- Updated daily and converted to your currency
THEY ARE NOT
- Final selling prices or what a dealer paid
- Appraisals or insurance valuations for a specific stone
- Investment advice or a forecast of where prices will go
- Prices for a finished ring — settings, taxes and markups are not included
Every number carries its receipt
Hover or tap any price in the explorer and you'll see exactly what it is built from.
[$ / CT]
Freshness, at a glance
If our data is late, you'll know. Old prices are never presented as today's.
| Current | ≤ 2 days | Shown normally, with its date | |
| Delayed | 3–7 days | Marked as delayed | |
| Stale | 8–30 days | Banner on every page | |
| Frozen | > 30 days | Prices dimmed, charts stop at the last real point |
Free and honest
DiamondTheGuide is free to use, with no account required. The numbers you see are the same numbers everyone sees — nothing is hidden behind a paywall or adjusted for a commercial relationship.
Some links to retailers may earn us a referral fee. Those links are always labeled, kept apart from the data, and never appear inside a chart, the price matrix or the stone viewer. Commercial relationships never decide which listings enter our prices.
Lab names like GIA and IGI are used only to describe how a stone was graded — we are not affiliated with any grading lab, trading network or retailer.
- All prices carry an as-of date and source label
- Stale data is flagged visibly before you see it
- Affiliate links are labeled and never touch the data
- Attribution shown in footer on every page
- No accounts, no tracking beyond anonymous analytics
- No mixing of grading labs without a clear label
SISTER PROJECT
Metal Price Explorer
Gold, silver and platinum prices — for what the setting costs.
Visit →Questions
Is this what I would pay for a diamond?
Not exactly. Our prices are medians of asking prices — what sellers list stones for. Real selling prices are often negotiated lower. A fair online retailer typically sits 20–45% above the benchmark we show. Settings, taxes, and retailer markups are not included. Benchmark data sourced from CaratAtlas (CC BY 4.0).
Why do prices jump at 1.00 ct?
Buyers pay a premium for stones at "magic" weights — 0.50, 1.00, 1.50, and 2.00 ct. A 0.95 ct stone of the same grades can cost meaningfully less per carat than a 1.00 ct stone. These jumps exist because demand clusters at round numbers. The size curve view in the explorer makes them visible.
Why are lab-grown prices so much lower?
Lab-grown diamonds are physically identical to natural ones but are produced at industrial scale via CVD or HPHT processes. Supply has grown rapidly, pushing wholesale prices down. As of late 2026 lab-grown prices have fallen more than 30% since early 2025. They also resell for a fraction of retail — factor that in before buying.
Can I use this to value a stone I already own?
Why does the same grade look different from GIA vs IGI?
Grading is done by humans using subjective criteria. Different labs apply their standards differently — an IGI VS1 and a GIA VS1 are not necessarily the same stone quality. We filter by grading lab and never mix labs in one median without a clear label.