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

As of October 2026, 5.00ct+ H SI1 lab grown radiant diamonds typically cost £678 GBP to £5,144 GBP, with a median price of £1,159 GBP. There are currently 17 diamonds matching this specification available across retailers.

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

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5.00ct+ H SI1 Lab Grown Radiant

Quick answer

As of October 2026, there are 17 lab grown radiant diamonds with H colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £678 GBP to £5,144 GBP, with a median of £1,159 GBP.

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. Radiant lab grown stones in the index: 474 USD per carat, -2.1% 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

£390 GBP

Highest Price

£8,163 GBP

Average Price

£2,128 GBP

Score Distribution

34 diamonds scored across 4 quality tiers

Excellent

12 (35.3%)

Very Good

5 (14.7%)

Good

7 (20.6%)

Average

10 (29.4%)

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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