How much does a 1.00 to 1.49ct J SI1 natural round diamond cost?

As of September 2026, 1.00 to 1.49ct J SI1 natural round diamonds typically cost $2,199 AUD to $5,965 AUD, with a median price of $3,270 AUD. There are currently 4,214 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI1 Natural Round

Quick answer

As of September 2026, there are 4,214 natural round diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,199 AUD to $5,965 AUD, with a median of $3,270 AUD. At least 58 retailers stock this exact specification. Half of all listings fall between $2,460 AUD and $3,571 AUD per carat. The same specification in lab grown form lists at a median of about $1,576 AUD per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round natural stones in the index: 2,094 USD per carat, -3.8% month on month. See the full index release

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

Last updated: September 2026

Available

4,214

Lowest Price

$220 AUD

Highest Price

$27,971 AUD

Average Price

$3,721 AUD

Market Intelligence

Retailers Selling

Price Spread

37.4%

Price Range

Price per carat distribution across retailers

$2,118/ct

10th Percentile

$1,482

Median

$2,118

90th Percentile

$3,069

Score Distribution

4.2K diamonds scored across 4 quality tiers

Excellent

504 (12.0%)

Very Good

1,202 (28.5%)

Good

1,273 (30.2%)

Average

1,233 (29.3%)

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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 11%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 34%

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