How much does a 1.00 to 1.49ct G I1 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct G I1 natural cushion diamonds typically cost $2,186 AUD to $5,943 AUD, with a median price of $3,944 AUD. There are currently 161 diamonds matching this specification available across retailers.

Where can I find the best price on a G I1 cushion diamond?

About 17% of these diamonds are available at multiple retailers, with an average price spread of 35%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G I1 Natural Cushion

Quick answer

As of September 2026, there are 161 natural cushion diamonds with G colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,186 AUD to $5,943 AUD, with a median of $3,944 AUD. At least 16 retailers stock this exact specification, and 17% of the stones appear at more than one of them, with an average price spread of 35%. Half of all listings fall between $2,443 AUD and $3,466 AUD per carat. The same specification in lab grown form lists at a median of about $1,663 AUD per carat. Over the last 30 days the median price moved -5.2% and the number of listings moved -2.3%.

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

161

Lowest Price

$1,338 AUD

Highest Price

$8,821 AUD

Average Price

$4,080 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

17.0%

Price Spread

35.4%

30-Day Price Trend

-5.2%

30-Day Supply Change

-2.3%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$2,054/ct

10th Percentile

$1,414

Median

$2,054

90th Percentile

$3,085

Score Distribution

161 diamonds scored across 4 quality tiers

Excellent

4 (2.5%)

Very Good

18 (11.2%)

Good

17 (10.6%)

Average

122 (75.8%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H I1H colour is visually identical to G to the naked eye

Save 20%

Lab-Grown G I1Same specifications, lab-grown origin

Save 42%

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