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

As of October 2026, 3.00 to 4.99ct J SI1 natural round diamonds typically cost $30,285 AUD to $74,081 AUD, with a median price of $47,063 AUD. There are currently 441 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 37%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Natural Round

Quick answer

As of October 2026, there are 441 natural round diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $30,285 AUD to $74,081 AUD, with a median of $47,063 AUD. At least 58 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 37%. Half of all listings fall between $10,106 AUD and $14,600 AUD per carat. The same specification in lab grown form lists at a median of about $9,791 AUD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +11.7%.

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

441

Lowest Price

$12,973 AUD

Highest Price

$147,152 AUD

Average Price

$49,871 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

39.1%

Price Spread

36.6%

30-Day Price Trend

-1.6%

30-Day Supply Change

+11.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$8,629/ct

10th Percentile

$5,953

Median

$8,629

90th Percentile

$11,939

Score Distribution

1.2K diamonds scored across 4 quality tiers

Excellent

106 (9.0%)

Very Good

301 (25.4%)

Good

215 (18.2%)

Average

561 (47.4%)

Find Your Diamond

Search 441 J SI1 round diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI2SI2 inclusions are not visible without magnification

Save 10%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 77%

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