How much does a 3.00 to 4.99ct G SI2 lab grown princess diamond cost?

As of October 2026, 3.00 to 4.99ct G SI2 lab grown princess diamonds typically cost £313 GBP to £3,778 GBP, with a median price of £574 GBP. There are currently 2 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 princess diamond?

About 41% of these diamonds are available at multiple retailers, with an average price spread of 127%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI2 Lab Grown Princess

Quick answer

As of October 2026, there are 2 lab grown princess diamonds with G colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £313 GBP to £3,778 GBP, with a median of £574 GBP. At least 21 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 127%. Half of all listings fall between £126 GBP and £402 GBP per carat. The same specification in natural form lists at a median of about £6,925 GBP per carat. Over the last 30 days the median price moved +30.3% and the number of listings moved +3.6%.

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. Princess lab grown stones in the index: 461 USD per carat, -4.8% 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

£290 GBP

Highest Price

£5,062 GBP

Average Price

£1,625 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.2%

Price Spread

127.0%

30-Day Price Trend

+30.3%

30-Day Supply Change

+3.6%

Volatility (30d)

0.05

Price Range

Price per carat distribution across retailers

$290/ct

10th Percentile

$133

Median

$290

90th Percentile

$728

Score Distribution

4 diamonds scored across 3 quality tiers

Excellent

1 (25.0%)

Very Good

2 (50.0%)

Average

1 (25.0%)

Find Your Diamond

Search 2 G SI2 princess diamonds and compare prices.

Search Diamonds

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