How much does a 0.50 to 0.74ct J SI1 natural round diamond cost?

As of October 2026, 0.50 to 0.74ct J SI1 natural round diamonds typically cost $660 AUD to $1,974 AUD, with a median price of $1,090 AUD. There are currently 3,163 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 52%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct J SI1 Natural Round

Quick answer

As of October 2026, there are 3,163 natural round diamonds with J colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $660 AUD to $1,974 AUD, with a median of $1,090 AUD. At least 61 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 52%. Half of all listings fall between $1,408 AUD and $2,334 AUD per carat. The same specification in lab grown form lists at a median of about $1,387 AUD per carat. Over the last 30 days the median price moved -2.9% and the number of listings moved +5.5%.

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

3,163

Lowest Price

$260 AUD

Highest Price

$3,784 AUD

Average Price

$1,220 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

39.0%

Price Spread

52.5%

30-Day Price Trend

-2.9%

30-Day Supply Change

+5.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,241/ct

10th Percentile

$812

Median

$1,241

90th Percentile

$2,396

Score Distribution

6.3K diamonds scored across 4 quality tiers

Excellent

1,156 (18.3%)

Very Good

1,662 (26.3%)

Good

1,562 (24.7%)

Average

1,940 (30.7%)

Find Your Diamond

Search 3,163 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 7%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 21%

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