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

As of October 2026, 1.50 to 1.99ct J SI2 natural marquise diamonds typically cost £2,287 GBP to £9,773 GBP, with a median price of £4,436 GBP. There are currently 196 diamonds matching this specification available across retailers.

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

About 40% 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 Marquise

Quick answer

As of October 2026, there are 196 natural marquise diamonds with J colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,287 GBP to £9,773 GBP, with a median of £4,436 GBP. At least 50 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between £2,045 GBP and £3,548 GBP per carat. Over the last 30 days the median price moved -1.8% and the number of listings moved +22.1%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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

196

Lowest Price

£1,434 GBP

Highest Price

£15,432 GBP

Average Price

£5,281 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

39.7%

Price Spread

54.3%

30-Day Price Trend

-1.8%

30-Day Supply Change

+22.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,711/ct

10th Percentile

$2,101

Median

$3,711

90th Percentile

$6,015

Score Distribution

505 diamonds scored across 4 quality tiers

Excellent

59 (11.7%)

Very Good

142 (28.1%)

Good

107 (21.2%)

Average

197 (39.0%)

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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