How much does a 1.00 to 1.49ct G SI2 natural heart diamond cost?

As of October 2026, 1.00 to 1.49ct G SI2 natural heart diamonds typically cost £988 GBP to £3,155 GBP, with a median price of £1,496 GBP. There are currently 491 diamonds matching this specification available across retailers.

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

About 44% of these diamonds are available at multiple retailers, with an average price spread of 59%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G SI2 Natural Heart

Quick answer

As of October 2026, there are 491 natural heart diamonds with G colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £988 GBP to £3,155 GBP, with a median of £1,496 GBP. At least 57 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 59%. Half of all listings fall between £1,189 GBP and £2,059 GBP per carat. The same specification in lab grown form lists at a median of about £1,168 GBP per carat. Over the last 30 days the median price moved -3.1% and the number of listings moved +16.2%.

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. Heart natural stones in the index: 2,374 USD per carat, +9.8% 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

491

Lowest Price

£619 GBP

Highest Price

£6,877 GBP

Average Price

£1,841 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

44.5%

Price Spread

59.2%

30-Day Price Trend

-3.1%

30-Day Supply Change

+16.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,958/ct

10th Percentile

$1,340

Median

$1,958

90th Percentile

$4,080

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

298 (26.0%)

Very Good

210 (18.3%)

Good

263 (23.0%)

Average

374 (32.7%)

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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

Save 4%

Lab-Grown G SI2Same specifications, lab-grown origin

Save 21%

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