How Much is a 4 Carat Diamond?
Updated for 2025. Analysis of current market prices for Natural vs Lab Grown diamonds at the 4ct weight class.
The Short Answer
Natural Market: Expect to pay between $65,000 and $95,000 for a good quality 4 carat natural diamond.
Lab Grown Market: Expect to pay between $3,000 and $6,000 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 4 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.
4 carat diamonds are rare and demand attention. The face-up size is substantial, spanning over 10mm. Finding a well-cut natural stone at this size requires expert sourcing.
Natural vs Lab Grown: The Price Visualized
Natural 4ct
Lab Grown 4ct
How Big is a 4 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 4 carat diamond is approximately 10.2 millimeters across. This is a substantial size that will stand out noticeably on the hand.
Where to Buy a 4 Carat Diamond
We recommend buying online to save 30-40% compared to traditional brick-and-mortar stores. Here are our top rated retailers for 4ct stones.