How much does a 5.00ct+ D SI1 lab grown oval diamond cost?

As of September 2026, 5.00ct+ D SI1 lab grown oval diamonds typically cost £622 GBP to £5,010 GBP, with a median price of £1,012 GBP. There are currently 23 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ D SI1 Lab Grown Oval

Quick answer

As of September 2026, there are 23 lab grown oval diamonds with D colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £622 GBP to £5,010 GBP, with a median of £1,012 GBP. At least 13 retailers stock this exact specification. Half of all listings fall between £207 GBP and £661 GBP per carat. The same specification in natural form lists at a median of about £25,879 GBP per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Oval lab grown stones in the index: 487 USD per carat, -11.2% month on month. See the full index release

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

Last updated: September 2026

Available

Lowest Price

£399 GBP

Highest Price

£5,043 GBP

Average Price

£1,968 GBP

Market Intelligence

Retailers Selling

Price Spread

182.4%

Price Range

Price per carat distribution across retailers

$336/ct

10th Percentile

$241

Median

$336

90th Percentile

$1,060

Score Distribution

23 diamonds scored across 4 quality tiers

Excellent

5 (21.7%)

Very Good

8 (34.8%)

Good

2 (8.7%)

Average

8 (34.8%)

Find Your Diamond

Search 23 D SI1 oval diamonds and compare prices.

Search Diamonds

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