Independent diamond research

Buying a diamond? Know whether you're getting a good one — and a fair price.

CaratSignal independently researches diamonds, prices and retailers so you can make a more informed purchase.

Find My Diamond — $99 Check a Diamond — $49

We don't sell diamonds. We research them for you.

Start here

Where are you in your diamond search?

Need help finding one?

Find My Diamond

$99

Tell us what matters. We research the market and return a buyer brief with candidates, context and trade-offs.

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Already found one?

Check My Diamond

$49

Send us the listing and grading report. We evaluate the specifications and pricing context independently.

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Still shopping?

CaratSignal Watch

$29/month

A future monitoring service for buyers who want to keep watching the market. Coming soon.

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Free starting point

Already looking at a diamond?

Run the numbers before you spend thousands. The Diamond Deal Checker gives you a place to start your research.

Check the Deal — Free

Market intelligence

What should a diamond actually cost?

1-carat diamond priceExplore index 1.5-carat diamond priceExplore index 2-carat diamond priceExplore index Natural diamond pricesExplore index Lab-grown diamond pricesExplore index

Explore the CaratSignal Price Index →

A different kind of diamond company

Research before retail.

A diamond is a major purchase. You deserve useful information before someone asks you to buy.

01We don't carry diamond inventory.

02We don't have a diamond to sell you.

03We compare the market.

04We explain the trade-offs.

From the research desk

Questions diamond buyers are asking

How much should a 1-carat diamond cost?

Is a lab-grown diamond a better value?

What does diamond cut quality really mean?