How much does a 1.00 to 1.49ct H SI1 natural heart diamond cost?

As of November 2026, 1.00 to 1.49ct H SI1 natural heart diamonds typically cost £1,101 GBP to £3,609 GBP, with a median price of £1,747 GBP. There are currently 423 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 heart diamond?

About 45% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct H SI1 Natural Heart

Quick answer

As of November 2026, there are 423 natural heart diamonds with H colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,101 GBP to £3,609 GBP, with a median of £1,747 GBP. At least 65 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between £1,240 GBP and £2,144 GBP per carat. The same specification in lab grown form lists at a median of about £640 GBP per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +12.3%.

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: November 2026

Available

423

Lowest Price

£726 GBP

Highest Price

£6,810 GBP

Average Price

£2,087 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

44.7%

Price Spread

57.5%

30-Day Price Trend

-1.1%

30-Day Supply Change

+12.3%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,109/ct

10th Percentile

$1,422

Median

$2,109

90th Percentile

$3,985

Score Distribution

973 diamonds scored across 4 quality tiers

Excellent

166 (17.1%)

Very Good

189 (19.4%)

Good

186 (19.1%)

Average

432 (44.4%)

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Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

Save 11%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 40%

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