How much does a 0.75 to 0.99ct J SI2 natural marquise diamond cost?

As of October 2026, 0.75 to 0.99ct J SI2 natural marquise diamonds typically cost £716 GBP to £1,815 GBP, with a median price of £1,175 GBP. There are currently 73 diamonds matching this specification available across retailers.

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

About 26% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J SI2 Natural Marquise

Quick answer

As of October 2026, there are 73 natural marquise diamonds with J colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £716 GBP to £1,815 GBP, with a median of £1,175 GBP. At least 46 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between £1,017 GBP and £1,683 GBP per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +13.6%.

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. 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

Lowest Price

£475 GBP

Highest Price

£3,528 GBP

Average Price

£1,261 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

25.6%

Price Spread

52.9%

30-Day Price Trend

-1.2%

30-Day Supply Change

+13.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,687/ct

10th Percentile

$1,083

Median

$1,687

90th Percentile

$2,954

Score Distribution

260 diamonds scored across 4 quality tiers

Excellent

14 (5.4%)

Very Good

42 (16.2%)

Good

43 (16.5%)

Average

161 (61.9%)

Find Your Diamond

Search 73 J SI2 marquise diamonds and compare prices.

Search Diamonds

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