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

As of October 2026, 5.00ct+ I SI1 natural oval diamonds typically cost HK$433,302 HKD to HK$1,616,197 HKD, with a median price of HK$772,409 HKD. There are currently 40 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ I SI1 Natural Oval

Quick answer

As of October 2026, there are 40 natural oval diamonds with I colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run HK$433,302 HKD to HK$1,616,197 HKD, with a median of HK$772,409 HKD. The same specification in lab grown form lists at a median of about HK$2,325 HKD 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

HK$306,657 HKD

Highest Price

HK$5,989,584 HKD

Average Price

HK$987,106 HKD

Score Distribution

109 diamonds scored across 4 quality tiers

Excellent

5 (4.6%)

Very Good

29 (26.6%)

Good

24 (22.0%)

Average

51 (46.8%)

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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