How much does a 5.00ct+ J SI2 natural round diamond cost?

As of September 2026, 5.00ct+ J SI2 natural round diamonds typically cost $49,425 AUD to $197,537 AUD, with a median price of $95,510 AUD. There are currently 377 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI2 round diamond?

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5.00ct+ J SI2 Natural Round

Quick answer

As of September 2026, there are 377 natural round diamonds with J colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $49,425 AUD to $197,537 AUD, with a median of $95,510 AUD. At least 8 retailers stock this exact specification. Half of all listings fall between $12,341 AUD and $15,584 AUD per carat. The same specification in lab grown form lists at a median of about $17,390 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

377

Lowest Price

$28,391 AUD

Highest Price

$996,829 AUD

Average Price

$112,728 AUD

Market Intelligence

Retailers Selling

Price Spread

22.5%

Price Range

Price per carat distribution across retailers

$10,318/ct

10th Percentile

$7,331

Median

$10,318

90th Percentile

$13,840

Score Distribution

377 diamonds scored across 4 quality tiers

Excellent

72 (19.1%)

Very Good

104 (27.6%)

Good

98 (26.0%)

Average

103 (27.3%)

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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