How much does a 5.00ct+ E SI1 lab grown radiant diamond cost?

As of October 2026, 5.00ct+ E SI1 lab grown radiant diamonds typically cost $875 AUD to $7,333 AUD, with a median price of $1,680 AUD. There are currently 51 diamonds matching this specification available across retailers.

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

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5.00ct+ E SI1 Lab Grown Radiant

Quick answer

As of October 2026, there are 51 lab grown radiant diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $875 AUD to $7,333 AUD, with a median of $1,680 AUD.

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. Radiant lab grown stones in the index: 474 USD per carat, -2.1% 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

Lowest Price

$707 AUD

Highest Price

$15,565 AUD

Average Price

$2,811 AUD

Score Distribution

110 diamonds scored across 4 quality tiers

Excellent

34 (30.9%)

Very Good

14 (12.7%)

Good

24 (21.8%)

Average

38 (34.5%)

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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