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

As of November 6, 2026, 3.00 to 4.99ct L SI1 natural round diamonds typically cost $18,105 AUD to $39,128 AUD, with a median price of $26,206 AUD. There are currently 281 diamonds matching this specification available across retailers.

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

About 62% of these diamonds are available at multiple retailers, with an average price spread of 28%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct L SI1 Natural Round

Quick answer

As of November 6, 2026, there are 281 natural round diamonds with L colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $18,105 AUD to $39,128 AUD, with a median of $26,206 AUD. Half of all listings fall between $6,980 AUD and $9,345 AUD per carat. The same specification in lab grown form lists at a median of about $1,923 AUD per carat. Over the last 30 days the median price moved -0.3% and the number of listings moved +10.1%.

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. Round natural stones in the index: 2,124 USD per carat, -6.9% 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

281

Lowest Price

$13,571 AUD

Highest Price

$67,219 AUD

Average Price

$27,761 AUD

Market Intelligence

Cross Retailer %

61.9%

Price Spread

28.2%

30-Day Price Trend

-0.3%

30-Day Supply Change

+10.1%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$5,862/ct

10th Percentile

$4,152

Median

$5,862

90th Percentile

$7,560

Score Distribution

281 diamonds scored across 4 quality tiers

Excellent

47 (16.7%)

Very Good

102 (36.3%)

Good

75 (26.7%)

Average

57 (20.3%)

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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