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

As of October 2026, 1.00 to 1.49ct J SI2 natural heart diamonds typically cost £865 GBP to £2,646 GBP, with a median price of £1,662 GBP. There are currently 189 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 66%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI2 Natural Heart

Quick answer

As of October 2026, there are 189 natural heart diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £865 GBP to £2,646 GBP, with a median of £1,662 GBP. At least 46 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 66%. Half of all listings fall between £955 GBP and £1,760 GBP per carat. Over the last 30 days the median price moved -3.4% and the number of listings moved +11.7%.

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

189

Lowest Price

£621 GBP

Highest Price

£5,861 GBP

Average Price

£1,723 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

37.7%

Price Spread

66.4%

30-Day Price Trend

-3.4%

30-Day Supply Change

+11.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,624/ct

10th Percentile

$1,128

Median

$1,624

90th Percentile

$3,078

Score Distribution

549 diamonds scored across 4 quality tiers

Excellent

64 (11.7%)

Very Good

59 (10.7%)

Good

120 (21.9%)

Average

306 (55.7%)

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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