How much does a 1.50 to 1.99ct G I1 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct G I1 natural round diamonds typically cost £2,072 GBP to £8,001 GBP, with a median price of £4,448 GBP. There are currently 256 diamonds matching this specification available across retailers.

Where can I find the best price on a G I1 round diamond?

About 26% of these diamonds are available at multiple retailers, with an average price spread of 65%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G I1 Natural Round

Quick answer

As of October 2026, there are 256 natural round diamonds with G colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,072 GBP to £8,001 GBP, with a median of £4,448 GBP. At least 31 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between £1,798 GBP and £3,450 GBP per carat. The same specification in lab grown form lists at a median of about £326 GBP per carat. Over the last 30 days the median price moved -5.0% and the number of listings moved +6.1%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

256

Lowest Price

£668 GBP

Highest Price

£13,920 GBP

Average Price

£4,709 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

25.6%

Price Spread

65.0%

30-Day Price Trend

-5.0%

30-Day Supply Change

+6.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,405/ct

10th Percentile

$1,709

Median

$3,405

90th Percentile

$5,899

Score Distribution

842 diamonds scored across 4 quality tiers

Excellent

88 (10.5%)

Very Good

168 (20.0%)

Good

133 (15.8%)

Average

453 (53.8%)

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Consider Instead

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

H I1H colour is visually identical to G to the naked eye

Save 8%

Lab-Grown G I1Same specifications, lab-grown origin

Save 87%

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