How much does a 0.50 to 0.74ct E SI1 lab grown round diamond cost?

As of October 2026, 0.50 to 0.74ct E SI1 lab grown round diamonds typically cost £95 GBP to £581 GBP, with a median price of £245 GBP. There are currently 324 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 103%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct E SI1 Lab Grown Round

Quick answer

As of October 2026, there are 324 lab grown round diamonds with E colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £95 GBP to £581 GBP, with a median of £245 GBP. At least 36 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 103%. Half of all listings fall between £240 GBP and £631 GBP per carat. The same specification in natural form lists at a median of about £1,424 GBP per carat. Over the last 30 days the median price moved -7.0% and the number of listings moved -2.7%.

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

324

Lowest Price

£63 GBP

Highest Price

£1,432 GBP

Average Price

£291 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

39.0%

Price Spread

103.1%

30-Day Price Trend

-7.0%

30-Day Supply Change

-2.7%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$504/ct

10th Percentile

$208

Median

$504

90th Percentile

$1,556

Score Distribution

632 diamonds scored across 4 quality tiers

Excellent

147 (23.3%)

Very Good

134 (21.2%)

Good

180 (28.5%)

Average

171 (27.1%)

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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