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

As of October 2026, 0.75 to 0.99ct G SI2 natural marquise diamonds typically cost £825 GBP to £2,321 GBP, with a median price of £1,499 GBP. There are currently 110 diamonds matching this specification available across retailers.

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

About 26% 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.

0.75 to 0.99ct G SI2 Natural Marquise

Quick answer

As of October 2026, there are 110 natural marquise diamonds with G colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £825 GBP to £2,321 GBP, with a median of £1,499 GBP. At least 49 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 49%. Half of all listings fall between £1,358 GBP and £2,200 GBP per carat. Over the last 30 days the median price moved -0.6% and the number of listings moved +2.5%.

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

110

Lowest Price

£491 GBP

Highest Price

£4,752 GBP

Average Price

£1,539 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

25.7%

Price Spread

48.9%

30-Day Price Trend

-0.6%

30-Day Supply Change

+2.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,310/ct

10th Percentile

$1,516

Median

$2,310

90th Percentile

$4,017

Score Distribution

335 diamonds scored across 4 quality tiers

Excellent

48 (14.3%)

Very Good

73 (21.8%)

Good

84 (25.1%)

Average

130 (38.8%)

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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