How much does a 5.00ct+ J SI1 natural radiant diamond cost?

As of September 2026, 5.00ct+ J SI1 natural radiant diamonds typically cost $71,662 AUD to $238,450 AUD, with a median price of $114,299 AUD. There are currently 87 diamonds matching this specification available across retailers.

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

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5.00ct+ J SI1 Natural Radiant

Quick answer

As of September 2026, there are 87 natural radiant diamonds with J colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $71,662 AUD to $238,450 AUD, with a median of $114,299 AUD. At least 11 retailers stock this exact specification. Half of all listings fall between $18,449 AUD and $28,023 AUD per carat. The same specification in lab grown form lists at a median of about $19,656 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. Radiant natural stones in the index: 2,765 USD per carat, +6.0% 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

Lowest Price

$42,886 AUD

Highest Price

$424,381 AUD

Average Price

$139,842 AUD

Market Intelligence

Retailers Selling

Price Spread

40.6%

Price Range

Price per carat distribution across retailers

$16,789/ct

10th Percentile

$10,802

Median

$16,789

90th Percentile

$23,086

Score Distribution

87 diamonds scored across 4 quality tiers

Excellent

8 (9.2%)

Very Good

20 (23.0%)

Good

21 (24.1%)

Average

38 (43.7%)

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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 27%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 17%

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