How much does a 1.00 to 1.49ct G SI2 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct G SI2 natural cushion diamonds typically cost £959 GBP to £3,370 GBP, with a median price of £1,820 GBP. There are currently 851 diamonds matching this specification available across retailers.

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1.00 to 1.49ct G SI2 Natural Cushion

Quick answer

As of September 2026, there are 851 natural cushion diamonds with G colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £959 GBP to £3,370 GBP, with a median of £1,820 GBP. At least 48 retailers stock this exact specification. Half of all listings fall between £1,311 GBP and £2,355 GBP per carat. The same specification in lab grown form lists at a median of about £1,019 GBP per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Cushion natural stones in the index: 2,792 USD per carat, +1.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

851

Lowest Price

£647 GBP

Highest Price

£7,083 GBP

Average Price

£1,990 GBP

Market Intelligence

Retailers Selling

Price Spread

59.4%

Price Range

Price per carat distribution across retailers

$2,232/ct

10th Percentile

$1,367

Median

$2,232

90th Percentile

$3,862

Score Distribution

851 diamonds scored across 4 quality tiers

Excellent

124 (14.6%)

Very Good

195 (22.9%)

Good

262 (30.8%)

Average

270 (31.7%)

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Lab-Grown G SI2Same specifications, lab-grown origin

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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