How much does a 3.00 to 4.99ct D SI1 lab grown round diamond cost?

As of October 2026, 3.00 to 4.99ct D SI1 lab grown round diamonds typically cost $404 USD to $3,154 USD, with a median price of $1,022 USD. There are currently 109 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI1 round diamond?

About 31% of these diamonds are available at multiple retailers, with an average price spread of 88%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI1 Lab Grown Round

Quick answer

As of October 2026, there are 109 lab grown round diamonds with D color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $404 USD to $3,154 USD, with a median of $1,022 USD. At least 39 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 88%. Half of all listings fall between $216 USD and $567 USD per carat. The same specification in natural form lists at a median of about $19,542 USD per carat. Over the last 30 days the median price moved +8.8% and the number of listings moved +15.3%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Round lab grown stones in the index: 414 USD per carat, -5.0% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

109

Lowest Price

$363 USD

Highest Price

$6,140 USD

Average Price

$1,431 USD

Market Intelligence

Retailers Selling

Cross Retailer %

30.7%

Price Spread

87.6%

30-Day Price Trend

+8.8%

30-Day Supply Change

+15.3%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$400/ct

10th Percentile

$148

Median

$400

90th Percentile

$828

Score Distribution

265 diamonds scored across 4 quality tiers

Excellent

101 (38.1%)

Very Good

33 (12.5%)

Good

36 (13.6%)

Average

95 (35.8%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1