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

As of November 2026, 1.00 to 1.49ct J SI1 natural heart diamonds typically cost £961 GBP to £2,895 GBP, with a median price of £1,575 GBP. There are currently 236 diamonds matching this specification available across retailers.

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

About 41% of these diamonds are available at multiple retailers, with an average price spread of 60%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI1 Natural Heart

Quick answer

As of November 2026, there are 236 natural heart diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £961 GBP to £2,895 GBP, with a median of £1,575 GBP. At least 57 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 60%. Half of all listings fall between £1,073 GBP and £1,901 GBP per carat. The same specification in lab grown form lists at a median of about £562 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, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Heart natural stones in the index: 2,289 USD per carat, -3.7% 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

236

Lowest Price

£649 GBP

Highest Price

£5,209 GBP

Average Price

£1,776 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

40.9%

Price Spread

60.4%

30-Day Price Trend

-1.1%

30-Day Supply Change

+12.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,838/ct

10th Percentile

$1,225

Median

$1,838

90th Percentile

$3,426

Score Distribution

643 diamonds scored across 4 quality tiers

Excellent

103 (16.0%)

Very Good

98 (15.2%)

Good

127 (19.8%)

Average

315 (49.0%)

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Consider Instead

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

J SI2SI2 inclusions are not visible without magnification

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Lab-Grown J SI1Same specifications, lab-grown origin

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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