How much does a 3.00 to 4.99ct G SI1 lab grown emerald diamond cost?

As of October 2026, 3.00 to 4.99ct G SI1 lab grown emerald diamonds typically cost £467 GBP to £2,386 GBP, with a median price of £987 GBP. There are currently 64 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 emerald diamond?

About 19% of these diamonds are available at multiple retailers, with an average price spread of 110%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI1 Lab Grown Emerald

Quick answer

As of October 2026, there are 64 lab grown emerald diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £467 GBP to £2,386 GBP, with a median of £987 GBP. At least 38 retailers stock this exact specification, and 19% of the stones appear at more than one of them, with an average price spread of 110%. Half of all listings fall between £177 GBP and £482 GBP per carat. The same specification in natural form lists at a median of about £12,523 GBP per carat. Over the last 30 days the median price moved +15.9% and the number of listings moved +8.1%.

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. Emerald lab grown stones in the index: 451 USD per carat, -8.3% 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

£200 GBP

Highest Price

£4,423 GBP

Average Price

£1,223 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

18.6%

Price Spread

109.8%

30-Day Price Trend

+15.9%

30-Day Supply Change

+8.1%

Volatility (30d)

0.06

Price Range

Price per carat distribution across retailers

$369/ct

10th Percentile

$136

Median

$369

90th Percentile

$876

Score Distribution

231 diamonds scored across 4 quality tiers

Excellent

26 (11.3%)

Very Good

16 (6.9%)

Good

34 (14.7%)

Average

155 (67.1%)

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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