How much does a 0.20 to 0.49ct G SI1 natural cushion diamond cost?

As of October 2026, 0.20 to 0.49ct G SI1 natural cushion diamonds typically cost £243 GBP to £535 GBP, with a median price of £336 GBP. There are currently 43 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 cushion diamond?

About 38% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G SI1 Natural Cushion

Quick answer

As of October 2026, there are 43 natural cushion diamonds with G colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £243 GBP to £535 GBP, with a median of £336 GBP. At least 11 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between £922 GBP and £1,328 GBP per carat. Over the last 30 days the median price moved -0.5% and the number of listings moved +0.6%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

£111 GBP

Highest Price

£1,129 GBP

Average Price

£367 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

37.5%

Price Spread

40.0%

30-Day Price Trend

-0.5%

30-Day Supply Change

+0.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,360/ct

10th Percentile

$894

Median

$1,360

90th Percentile

$2,221

Score Distribution

110 diamonds scored across 4 quality tiers

Excellent

15 (13.6%)

Very Good

21 (19.1%)

Good

50 (45.5%)

Average

24 (21.8%)

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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