Diamond Buying Guide
Everything you need to know about buying diamonds
The 4Cs Explained
Cut, Color, Clarity, and Carat. What actually matters, what the grades mean, and where to spend your budget for the biggest impact.
Read moreDiamond Shapes
From classic Round Brilliant to dramatic Marquise. See how each shape looks, what proportions to target, and how shape affects price.
Read moreThe 5th C, Our Caratlytics
How we score every diamond from 0-100. Quality, value, certification, and market data combined into one number so you can spot the best stones instantly.
Read moreLab-Grown vs Natural
The honest comparison between lab-grown and natural diamonds. Price data, resale reality, certification differences, and when each makes sense.
Read moreThe Insider's Playbook
Street-smart strategies, negotiation tactics, and money-saving tricks the diamond industry would rather you did not know
Read moreUser Guide
A complete walkthrough of every feature: searching, comparing, price tracking, market intelligence, Lucy AI, and more.
Read moreWhy compare prices?
The same certified diamond, with the exact same GIA or IGI number, can be listed at wildly different prices depending on the retailer. A 1.5 carat, G colour, VS2, Excellent cut Round Brilliant might be $7,200 at one store and $9,800 at another. Same stone, same certificate, different markup.
This happens because many online diamond retailers list overlapping inventory. They carry the same stones but apply different margins. Carat Hunter tracks millions of listings across 100+ retailers, matching diamonds by their certificate numbers so you can see every price for the same stone side by side.
On average, lab grown diamonds show an 87% price spread between the cheapest and most expensive listing. For natural diamonds, the average spread is 34%. That adds up to hundreds or thousands of dollars on a single purchase.
Before you start shopping
Natural or lab grown?
Lab grown diamonds are chemically and optically identical to natural diamonds. The only difference is origin: one formed over billions of years underground, the other in a reactor over a few weeks. Lab grown stones cost 60-80% less for the same specs. Neither choice is wrong. It comes down to what matters to you: the story of the stone or the size of it on your finger.
Look for certification
A certificate from GIA (Gemological Institute of America) or IGI (International Gemological Institute) is your guarantee that a diamond is what the seller claims. Without one, you are trusting the retailer's word on colour, clarity, and everything else. GIA is the gold standard for natural diamonds. IGI is widely trusted for lab grown. Look for the certificate number and you can verify the stone independently.
Set a budget, then optimise
Decide what you want to spend before you start browsing. Then use the 4Cs to figure out where to prioritise. Cut quality has the biggest impact on how a diamond looks in person, so never compromise there. You can often drop a colour or clarity grade without any visible difference, and put that savings toward a larger stone or better cut.