How Much is a 1 Carat Diamond?
Updated for 2025. Analysis of current market prices for Natural vs Lab Grown diamonds at the 1ct weight class.
The Short Answer
Natural Market: Expect to pay between $3,500 and $8,000 for a good quality 1 carat natural diamond.
Lab Grown Market: Expect to pay between $500 and $1,000 for a similar quality lab-grown stone.
*Prices are based on GIA/IGI certified stones with G-H Color and VS Clarity. ideal Cut.
Detailed Price Breakdown
When shopping for a 1 carat diamond, the price is heavily influenced by the "4Cs": Cut, Color, Clarity, and Carat. However, the origin (Natural vs. Lab) is the biggest price multiplier.
The 1 carat diamond is the benchmark for engagement rings. It is the most popular weight, meaning demand keeps prices firm, but it holds its value well.
Natural vs Lab Grown: The Price Visualized
Natural 1ct
Lab Grown 1ct
How Big is a 1 Carat Diamond?
Carat is a measure of weight, not visual size. However, for a standard round brilliant cut diamond, we can estimate the diameter.
A 1 carat diamond is approximately 6.5 millimeters across. This provides excellent finger coverage.
Where to Buy a 1 Carat Diamond
We recommend buying online to save 30-40% compared to traditional brick-and-mortar stores. Here are our top rated retailers for 1ct stones.