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

As of October 2026, 3.00 to 4.99ct D SI1 lab grown oval diamonds typically cost £320 GBP to £2,744 GBP, with a median price of £999 GBP. There are currently 107 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 99%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 107 lab grown oval diamonds with D colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £320 GBP to £2,744 GBP, with a median of £999 GBP. At least 39 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 99%. Half of all listings fall between £171 GBP and £478 GBP per carat. The same specification in natural form lists at a median of about £13,455 GBP per carat. Over the last 30 days the median price moved +20.5% and the number of listings moved +19.6%.

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. Oval lab grown stones in the index: 453 USD per carat, -7.4% 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

107

Lowest Price

£288 GBP

Highest Price

£4,851 GBP

Average Price

£1,230 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

38.5%

Price Spread

99.2%

30-Day Price Trend

+20.5%

30-Day Supply Change

+19.6%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$412/ct

10th Percentile

$148

Median

$412

90th Percentile

$1,108

Score Distribution

247 diamonds scored across 4 quality tiers

Excellent

84 (34.0%)

Very Good

25 (10.1%)

Good

40 (16.2%)

Average

98 (39.7%)

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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