How much does a 0.75 to 0.99ct G SI2 lab grown radiant diamond cost?

As of October 2026, 0.75 to 0.99ct G SI2 lab grown radiant diamonds typically cost £104 GBP to £381 GBP, with a median price of £188 GBP. There are currently 9 diamonds matching this specification available across retailers.

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

About 67% of these diamonds are available at multiple retailers, with an average price spread of 112%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct G SI2 Lab Grown Radiant

Quick answer

As of October 2026, there are 9 lab grown radiant diamonds with G colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £104 GBP to £381 GBP, with a median of £188 GBP. At least 16 retailers stock this exact specification, and 67% of the stones appear at more than one of them, with an average price spread of 112%. Half of all listings fall between £161 GBP and £531 GBP per carat. The same specification in natural form lists at a median of about £1,436 GBP per carat. Over the last 30 days the median price moved +0.0% and the number of listings moved +7.0%.

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. Radiant lab grown stones in the index: 474 USD per carat, -2.1% 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

Lowest Price

£78 GBP

Highest Price

£718 GBP

Average Price

£200 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

66.7%

Price Spread

111.7%

30-Day Price Trend

+0.0%

30-Day Supply Change

+7.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$441/ct

10th Percentile

$185

Median

$441

90th Percentile

$870

Score Distribution

12 diamonds scored across 3 quality tiers

Excellent

3 (25.0%)

Very Good

6 (50.0%)

Average

3 (25.0%)

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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