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

As of October 2026, 5.00ct+ E SI1 lab grown round diamonds typically cost $1,161 NZD to $10,707 NZD, with a median price of $2,559 NZD. There are currently 167 diamonds matching this specification available across retailers.

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

About 47% of these diamonds are available at multiple retailers, with an average price spread of 112%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ E SI1 Lab Grown Round

Quick answer

As of October 2026, there are 167 lab grown round diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $1,161 NZD to $10,707 NZD, with a median of $2,559 NZD. At least 26 retailers stock this exact specification, and 47% of the stones appear at more than one of them, with an average price spread of 112%. Half of all listings fall between $432 NZD and $1,161 NZD per carat. The same specification in natural form lists at a median of about $52,642 NZD per carat. Over the last 30 days the median price moved -5.3% and the number of listings moved +8.5%.

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

167

Lowest Price

$914 NZD

Highest Price

$46,194 NZD

Average Price

$4,351 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

46.9%

Price Spread

112.0%

30-Day Price Trend

-5.3%

30-Day Supply Change

+8.5%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$365/ct

10th Percentile

$190

Median

$365

90th Percentile

$895

Score Distribution

342 diamonds scored across 4 quality tiers

Excellent

152 (44.4%)

Very Good

42 (12.3%)

Good

50 (14.6%)

Average

98 (28.7%)

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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 8%

E SI2SI2 inclusions are not visible without magnification

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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