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

As of November 2026, 1.00 to 1.49ct J SI1 natural marquise diamonds typically cost £1,309 GBP to £3,910 GBP, with a median price of £2,074 GBP. There are currently 211 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 49%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI1 Natural Marquise

Quick answer

As of November 2026, there are 211 natural marquise diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,309 GBP to £3,910 GBP, with a median of £2,074 GBP. At least 56 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 49%. Half of all listings fall between £1,442 GBP and £2,362 GBP per carat. Over the last 30 days the median price moved -0.0% and the number of listings moved +15.3%.

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. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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: November 2026

Available

211

Lowest Price

£860 GBP

Highest Price

£9,392 GBP

Average Price

£2,423 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

36.1%

Price Spread

49.2%

30-Day Price Trend

-0.0%

30-Day Supply Change

+15.3%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,504/ct

10th Percentile

$1,533

Median

$2,504

90th Percentile

$4,104

Score Distribution

574 diamonds scored across 4 quality tiers

Excellent

60 (10.5%)

Very Good

117 (20.4%)

Good

144 (25.1%)

Average

253 (44.1%)

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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