How much does a 1.00 to 1.49ct G I1 natural round diamond cost?

As of October 2026, 1.00 to 1.49ct G I1 natural round diamonds typically cost £1,096 GBP to £3,452 GBP, with a median price of £1,955 GBP. There are currently 737 diamonds matching this specification available across retailers.

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

About 34% 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.

1.00 to 1.49ct G I1 Natural Round

Quick answer

As of October 2026, there are 737 natural round diamonds with G colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,096 GBP to £3,452 GBP, with a median of £1,955 GBP. At least 31 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between £1,211 GBP and £2,261 GBP per carat. The same specification in lab grown form lists at a median of about £629 GBP per carat. Over the last 30 days the median price moved -4.4% and the number of listings moved +2.9%.

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. 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

737

Lowest Price

£563 GBP

Highest Price

£5,954 GBP

Average Price

£2,133 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

34.1%

Price Spread

65.2%

30-Day Price Trend

-4.4%

30-Day Supply Change

+2.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,159/ct

10th Percentile

$1,247

Median

$2,159

90th Percentile

$4,205

Score Distribution

1.9K diamonds scored across 4 quality tiers

Excellent

216 (11.3%)

Very Good

376 (19.7%)

Good

300 (15.7%)

Average

1,021 (53.4%)

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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 11%

Lab-Grown G I1Same specifications, lab-grown origin

Save 44%

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