How much does a 1.50 to 1.99ct J SI2 natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct J SI2 natural radiant diamonds typically cost £2,196 GBP to £5,861 GBP, with a median price of £3,686 GBP. There are currently 132 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI2 Natural Radiant

Quick answer

As of October 2026, there are 132 natural radiant diamonds with J colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,196 GBP to £5,861 GBP, with a median of £3,686 GBP. At least 50 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between £1,613 GBP and £2,760 GBP per carat. Over the last 30 days the median price moved -1.9% and the number of listings moved +23.3%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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

132

Lowest Price

£1,341 GBP

Highest Price

£10,710 GBP

Average Price

£3,875 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

31.3%

Price Spread

53.6%

30-Day Price Trend

-1.9%

30-Day Supply Change

+23.3%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,849/ct

10th Percentile

$1,806

Median

$2,849

90th Percentile

$4,466

Score Distribution

547 diamonds scored across 4 quality tiers

Excellent

67 (12.2%)

Very Good

88 (16.1%)

Good

104 (19.0%)

Average

288 (52.7%)

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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