How much does a 3.00 to 4.99ct L SI1 natural cushion diamond cost?

As of November 7, 2026, 3.00 to 4.99ct L SI1 natural cushion diamonds typically cost $14,236 AUD to $41,486 AUD, with a median price of $26,678 AUD. There are currently 40 diamonds matching this specification available across retailers.

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

About 45% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct L SI1 Natural Cushion

Quick answer

As of November 7, 2026, there are 40 natural cushion diamonds with L colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $14,236 AUD to $41,486 AUD, with a median of $26,678 AUD. Half of all listings fall between $5,738 AUD and $9,741 AUD per carat. The same specification in lab grown form lists at a median of about $1,776 AUD per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +14.7%.

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 7, 2026

Available

Lowest Price

$9,970 AUD

Highest Price

$64,039 AUD

Average Price

$26,974 AUD

Market Intelligence

Cross Retailer %

45.0%

Price Spread

52.6%

30-Day Price Trend

+0.4%

30-Day Supply Change

+14.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,228/ct

10th Percentile

$3,236

Median

$5,228

90th Percentile

$8,635

Score Distribution

40 diamonds scored across 4 quality tiers

Excellent

6 (15.0%)

Very Good

6 (15.0%)

Good

15 (37.5%)

Average

13 (32.5%)

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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