How much does a 3.00 to 4.99ct D SI2 natural round diamond cost?

As of October 2026, 3.00 to 4.99ct D SI2 natural round diamonds typically cost $43,288 AUD to $119,785 AUD, with a median price of $72,091 AUD. There are currently 235 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI2 round diamond?

About 36% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI2 Natural Round

Quick answer

As of October 2026, there are 235 natural round diamonds with D colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $43,288 AUD to $119,785 AUD, with a median of $72,091 AUD. At least 54 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between $15,931 AUD and $23,834 AUD per carat. The same specification in lab grown form lists at a median of about $518 AUD per carat. Over the last 30 days the median price moved +0.5% and the number of listings moved +9.1%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Round natural stones in the index: 2,248 USD per carat, +7.6% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

235

Lowest Price

$26,646 AUD

Highest Price

$224,691 AUD

Average Price

$78,300 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

36.0%

Price Spread

40.4%

30-Day Price Trend

+0.5%

30-Day Supply Change

+9.1%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$13,732/ct

10th Percentile

$9,260

Median

$13,732

90th Percentile

$20,365

Score Distribution

594 diamonds scored across 4 quality tiers

Excellent

146 (24.6%)

Very Good

137 (23.1%)

Good

139 (23.4%)

Average

172 (29.0%)

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Consider Instead

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

D I1I1 inclusions are not visible without magnification

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Lab-Grown D SI2Same specifications, lab-grown origin

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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