How much does a 5.00ct+ G SI2 lab grown oval diamond cost?

As of September 2026, 5.00ct+ G SI2 lab grown oval diamonds typically cost £650 GBP to £3,613 GBP, with a median price of £761 GBP. There are currently 9 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 oval diamond?

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5.00ct+ G SI2 Lab Grown Oval

Quick answer

As of September 2026, there are 9 lab grown oval diamonds with G colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £650 GBP to £3,613 GBP, with a median of £761 GBP. At least 10 retailers stock this exact specification. Half of all listings fall between £3,346 GBP and £20,103 GBP per carat. The same specification in natural form lists at a median of about £12,648 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

£600 GBP

Highest Price

£4,523 GBP

Average Price

£1,436 GBP

Market Intelligence

Retailers Selling

Price Spread

134.5%

Price Range

Price per carat distribution across retailers

$16,834/ct

10th Percentile

$232

Median

$16,834

90th Percentile

$29,893

Score Distribution

9 diamonds scored across 3 quality tiers

Excellent

4 (44.4%)

Very Good

2 (22.2%)

Average

3 (33.3%)

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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