How much does a 5.00ct+ H SI1 natural oval diamond cost?

As of October 2026, 5.00ct+ H SI1 natural oval diamonds typically cost £59,524 GBP to £183,899 GBP, with a median price of £86,010 GBP. There are currently 30 diamonds matching this specification available across retailers.

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

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5.00ct+ H SI1 Natural Oval

Quick answer

As of October 2026, there are 30 natural oval diamonds with H colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £59,524 GBP to £183,899 GBP, with a median of £86,010 GBP. The same specification in lab grown form lists at a median of about £345 GBP per carat.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

£29,805 GBP

Highest Price

£476,343 GBP

Average Price

£114,328 GBP

Score Distribution

106 diamonds scored across 4 quality tiers

Excellent

1 (0.9%)

Very Good

17 (16.0%)

Good

24 (22.6%)

Average

64 (60.4%)

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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