How much does a 3.00 to 4.99ct E SI1 lab grown radiant diamond cost?

As of October 2026, 3.00 to 4.99ct E SI1 lab grown radiant diamonds typically cost $659 AUD to $5,378 AUD, with a median price of $1,871 AUD. There are currently 203 diamonds matching this specification available across retailers.

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

About 26% of these diamonds are available at multiple retailers, with an average price spread of 102%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Lab Grown Radiant

Quick answer

As of October 2026, there are 203 lab grown radiant diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $659 AUD to $5,378 AUD, with a median of $1,871 AUD. At least 36 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 102%. Half of all listings fall between $330 AUD and $943 AUD per carat. The same specification in natural form lists at a median of about $23,432 AUD per carat. Over the last 30 days the median price moved +20.6% and the number of listings moved +13.8%.

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

203

Lowest Price

$400 AUD

Highest Price

$10,305 AUD

Average Price

$2,553 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

25.6%

Price Spread

102.3%

30-Day Price Trend

+20.6%

30-Day Supply Change

+13.8%

Volatility (30d)

0.09

Price Range

Price per carat distribution across retailers

$421/ct

10th Percentile

$152

Median

$421

90th Percentile

$991

Score Distribution

333 diamonds scored across 4 quality tiers

Excellent

46 (13.8%)

Very Good

29 (8.7%)

Good

148 (44.4%)

Average

110 (33.0%)

Find Your Diamond

Search 203 E SI1 radiant diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

F SI1F colour is visually identical to E to the naked eye

Save 5%

E SI2SI2 inclusions are not visible without magnification

Save 46%

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