How much does a 1.50 to 1.99ct J SI1 natural heart diamond cost?

As of October 2026, 1.50 to 1.99ct J SI1 natural heart diamonds typically cost £2,122 GBP to £6,989 GBP, with a median price of £3,746 GBP. There are currently 128 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI1 Natural Heart

Quick answer

As of October 2026, there are 128 natural heart diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,122 GBP to £6,989 GBP, with a median of £3,746 GBP. At least 53 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between £1,611 GBP and £2,644 GBP per carat. Over the last 30 days the median price moved +0.1% and the number of listings moved +11.6%.

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

128

Lowest Price

£1,626 GBP

Highest Price

£9,982 GBP

Average Price

£4,131 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

42.1%

Price Spread

50.6%

30-Day Price Trend

+0.1%

30-Day Supply Change

+11.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,739/ct

10th Percentile

$1,753

Median

$2,739

90th Percentile

$4,548

Score Distribution

397 diamonds scored across 4 quality tiers

Excellent

57 (14.4%)

Very Good

60 (15.1%)

Good

54 (13.6%)

Average

226 (56.9%)

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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