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

As of November 2026, 1.50 to 1.99ct G SI2 natural marquise diamonds typically cost £2,674 GBP to £10,834 GBP, with a median price of £5,499 GBP. There are currently 215 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI2 Natural Marquise

Quick answer

As of November 2026, there are 215 natural marquise diamonds with G colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,674 GBP to £10,834 GBP, with a median of £5,499 GBP. At least 52 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between £3,024 GBP and £5,089 GBP per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +13.0%.

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: November 2026

Available

215

Lowest Price

£1,715 GBP

Highest Price

£22,450 GBP

Average Price

£6,190 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

36.0%

Price Spread

49.9%

30-Day Price Trend

-1.5%

30-Day Supply Change

+13.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,542/ct

10th Percentile

$3,065

Median

$5,542

90th Percentile

$8,628

Score Distribution

552 diamonds scored across 4 quality tiers

Excellent

136 (24.6%)

Very Good

158 (28.6%)

Good

110 (19.9%)

Average

148 (26.8%)

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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