How much does a 3.00 to 4.99ct D SI1 lab grown round diamond cost?

As of October 2026, 3.00 to 4.99ct D SI1 lab grown round diamonds typically cost $564 AUD to $4,489 AUD, with a median price of $1,438 AUD. There are currently 101 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 88%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI1 Lab Grown Round

Quick answer

As of October 2026, there are 101 lab grown round diamonds with D colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $564 AUD to $4,489 AUD, with a median of $1,438 AUD. At least 39 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 88%. Half of all listings fall between $308 AUD and $806 AUD per carat. The same specification in natural form lists at a median of about $27,816 AUD per carat. Over the last 30 days the median price moved +8.8% and the number of listings moved +15.3%.

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 lab grown stones in the index: 414 USD per carat, -5.0% 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

101

Lowest Price

$508 AUD

Highest Price

$8,740 AUD

Average Price

$2,027 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

30.7%

Price Spread

87.6%

30-Day Price Trend

+8.8%

30-Day Supply Change

+15.3%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$400/ct

10th Percentile

$148

Median

$400

90th Percentile

$828

Score Distribution

223 diamonds scored across 4 quality tiers

Excellent

92 (41.3%)

Very Good

30 (13.5%)

Good

29 (13.0%)

Average

72 (32.3%)

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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