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

As of October 2026, 1.00 to 1.49ct F SI1 natural heart diamonds typically cost £1,178 GBP to £4,161 GBP, with a median price of £1,696 GBP. There are currently 284 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 58%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct F SI1 Natural Heart

Quick answer

As of October 2026, there are 284 natural heart diamonds with F colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,178 GBP to £4,161 GBP, with a median of £1,696 GBP. At least 65 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 58%. Half of all listings fall between £1,417 GBP and £2,435 GBP per carat. The same specification in lab grown form lists at a median of about £359 GBP per carat. Over the last 30 days the median price moved -3.5% and the number of listings moved +15.2%.

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

284

Lowest Price

£423 GBP

Highest Price

£9,011 GBP

Average Price

£2,254 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

38.4%

Price Spread

58.0%

30-Day Price Trend

-3.5%

30-Day Supply Change

+15.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,338/ct

10th Percentile

$1,637

Median

$2,338

90th Percentile

$4,383

Score Distribution

831 diamonds scored across 4 quality tiers

Excellent

147 (17.7%)

Very Good

163 (19.6%)

Good

181 (21.8%)

Average

340 (40.9%)

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Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

Save 16%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 80%

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