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

As of September 2026, 1.00 to 1.49ct G I1 natural round diamonds typically cost £996 GBP to £2,797 GBP, with a median price of £1,628 GBP. There are currently 1,678 diamonds matching this specification available across retailers.

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

About 61% 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.

1.00 to 1.49ct G I1 Natural Round

Quick answer

As of September 2026, there are 1,678 natural round diamonds with G colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £996 GBP to £2,797 GBP, with a median of £1,628 GBP. At least 28 retailers stock this exact specification, and 61% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between £1,257 GBP and £2,137 GBP per carat. The same specification in lab grown form lists at a median of about £1,689 GBP per carat. Over the last 30 days the median price moved -3.3% and the number of listings moved +16.1%.

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. Round natural stones in the index: 2,094 USD per carat, -3.8% 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

1,678

Lowest Price

£449 GBP

Highest Price

£7,510 GBP

Average Price

£1,792 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

61.2%

Price Spread

53.9%

30-Day Price Trend

-3.3%

30-Day Supply Change

+16.1%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$2,198/ct

10th Percentile

$1,303

Median

$2,198

90th Percentile

$3,753

Score Distribution

1.7K diamonds scored across 4 quality tiers

Excellent

223 (13.3%)

Very Good

589 (35.1%)

Good

490 (29.2%)

Average

376 (22.4%)

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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

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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