How much does a 5.00ct+ H SI1 lab grown princess diamond cost?

As of September 2026, 5.00ct+ H SI1 lab grown princess diamonds typically cost £609 GBP to £19,936 GBP, with a median price of £4,479 GBP. There are currently 14 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 princess diamond?

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5.00ct+ H SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 14 lab grown princess diamonds with H colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £609 GBP to £19,936 GBP, with a median of £4,479 GBP. At least 12 retailers stock this exact specification. Half of all listings fall between £472 GBP and £2,124 GBP per carat. The same specification in natural form lists at a median of about £10,802 GBP per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Princess lab grown stones in the index: 481 USD per carat, -7.3% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

£505 GBP

Highest Price

£21,765 GBP

Average Price

£8,698 GBP

Market Intelligence

Retailers Selling

Price Spread

114.8%

Price Range

Price per carat distribution across retailers

$1,943/ct

10th Percentile

$224

Median

$1,943

90th Percentile

$4,231

Score Distribution

14 diamonds scored across 3 quality tiers

Excellent

1 (7.1%)

Very Good

7 (50.0%)

Good

6 (42.9%)

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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