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

As of November 6, 2026, 3.00 to 4.99ct M SI1 natural round diamonds typically cost $16,813 AUD to $44,359 AUD, with a median price of $23,756 AUD. There are currently 121 diamonds matching this specification available across retailers.

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

About 48% of these diamonds are available at multiple retailers, with an average price spread of 43%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct M SI1 Natural Round

Quick answer

As of November 6, 2026, there are 121 natural round diamonds with M colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $16,813 AUD to $44,359 AUD, with a median of $23,756 AUD. Half of all listings fall between $6,181 AUD and $9,357 AUD per carat. The same specification in lab grown form lists at a median of about $4,582 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

121

Lowest Price

$13,566 AUD

Highest Price

$59,244 AUD

Average Price

$27,312 AUD

Market Intelligence

Cross Retailer %

47.9%

Price Spread

42.6%

30-Day Price Trend

-0.3%

30-Day Supply Change

+10.1%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$5,216/ct

10th Percentile

$3,889

Median

$5,216

90th Percentile

$7,821

Score Distribution

121 diamonds scored across 4 quality tiers

Excellent

22 (18.2%)

Very Good

48 (39.7%)

Good

30 (24.8%)

Average

21 (17.4%)

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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