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

As of October 2026, 3.00 to 4.99ct E SI1 lab grown round diamonds typically cost $817 NZD to $4,921 NZD, with a median price of $2,608 NZD. There are currently 370 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 89%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Lab Grown Round

Quick answer

As of October 2026, there are 370 lab grown round diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $817 NZD to $4,921 NZD, with a median of $2,608 NZD. At least 40 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 89%. Half of all listings fall between $381 NZD and $1,006 NZD per carat. The same specification in natural form lists at a median of about $35,071 NZD per carat. Over the last 30 days the median price moved +5.8% and the number of listings moved +18.7%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

370

Lowest Price

$593 NZD

Highest Price

$11,751 NZD

Average Price

$2,663 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

31.0%

Price Spread

88.9%

30-Day Price Trend

+5.8%

30-Day Supply Change

+18.7%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$395/ct

10th Percentile

$147

Median

$395

90th Percentile

$826

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

297 (26.1%)

Very Good

120 (10.5%)

Good

111 (9.8%)

Average

610 (53.6%)

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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