How much does a 1.50 to 1.99ct G SI2 natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct G SI2 natural radiant diamonds typically cost £2,685 GBP to £8,405 GBP, with a median price of £4,670 GBP. There are currently 141 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI2 Natural Radiant

Quick answer

As of October 2026, there are 141 natural radiant diamonds with G colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,685 GBP to £8,405 GBP, with a median of £4,670 GBP. At least 55 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between £2,479 GBP and £4,226 GBP per carat. The same specification in lab grown form lists at a median of about £268 GBP per carat. Over the last 30 days the median price moved -2.2% and the number of listings moved +17.9%.

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 natural stones in the index: 3,091 USD per carat, +13.2% 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

141

Lowest Price

£1,648 GBP

Highest Price

£13,925 GBP

Average Price

£5,185 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

36.5%

Price Spread

53.7%

30-Day Price Trend

-2.2%

30-Day Supply Change

+17.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,321/ct

10th Percentile

$2,670

Median

$4,321

90th Percentile

$6,965

Score Distribution

382 diamonds scored across 4 quality tiers

Excellent

84 (22.0%)

Very Good

103 (27.0%)

Good

75 (19.6%)

Average

120 (31.4%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI2H colour is visually identical to G to the naked eye

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Lab-Grown G SI2Same specifications, lab-grown origin

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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