The 4Cs, priced
Diamond Price Estimator
Set the carat weight, colour, clarity, cut and shape and the estimator returns a retail price range for a certified stone, natural or lab-grown, plus the typical resale offer. Estimates, not appraisals, but close enough to know when a price is wrong.
How the estimate works
The estimator starts from a base price per carat for a natural, round, G colour, VS1, Excellent cut diamond in the one-carat bracket and applies multipliers for carat bracket, colour, clarity, cut and shape. Lab-grown stones are priced at a fraction of natural ones, reflecting the current market. The result is a retail range for a certified stone; the resale figure is what a buyer would typically offer.
Reading the result
If a jeweler’s price sits well above the range, ask why: a famous brand, exceptional cut, or margin. If it sits well below, check the report. See the guides on the 4Cs and on reading a certificate.
More tools
Keep going
Live spot price
Gold Calculator
Calculate the fine metal value of gold, silver, platinum or palladium jewelry, coins and scrap from the live spot price: weight, purity, currency, and what buyers typically pay.
OpenPre-owned market
Watch Valuation
Estimate the pre-owned market value and the typical dealer offer for a luxury watch by brand, model, condition, box and papers.
OpenUS, UK, EU, Japan
Ring Size Converter
Convert ring sizes between US, UK, EU and Japanese systems from the inside diameter or circumference of a ring, with instructions for measuring at home.
Open