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

As of November 6, 2026, 1.00 to 1.49ct K SI2 natural cushion diamonds typically cost $1,112 AUD to $3,735 AUD, with a median price of $2,152 AUD. There are currently 286 diamonds matching this specification available across retailers.

Where can I find the best price on a K SI2 cushion diamond?

About 37% of these diamonds are available at multiple retailers, with an average price spread of 74%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct K SI2 Natural Cushion

Quick answer

As of November 6, 2026, there are 286 natural cushion diamonds with K colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,112 AUD to $3,735 AUD, with a median of $2,152 AUD. Half of all listings fall between $1,391 AUD and $2,890 AUD per carat. The same specification in lab grown form lists at a median of about $6,296 AUD per carat. Over the last 30 days the median price moved +0.6% and the number of listings moved +4.6%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Cushion natural stones in the index: 2,881 USD per carat, -2.5% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

286

Lowest Price

$959 AUD

Highest Price

$7,240 AUD

Average Price

$2,352 AUD

Market Intelligence

Cross Retailer %

37.1%

Price Spread

74.5%

30-Day Price Trend

+0.6%

30-Day Supply Change

+4.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,383/ct

10th Percentile

$760

Median

$1,383

90th Percentile

$2,322

Score Distribution

286 diamonds scored across 4 quality tiers

Excellent

37 (12.9%)

Very Good

87 (30.4%)

Good

74 (25.9%)

Average

88 (30.8%)

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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