How much does a 5.00ct+ D SI1 natural cushion diamond cost?

As of September 2026, 5.00ct+ D SI1 natural cushion diamonds typically cost HK$639,387 HKD to HK$2,487,711 HKD, with a median price of HK$1,007,164 HKD. There are currently 67 diamonds matching this specification available across retailers.

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

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5.00ct+ D SI1 Natural Cushion

Quick answer

As of September 2026, there are 67 natural cushion diamonds with D colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run HK$639,387 HKD to HK$2,487,711 HKD, with a median of HK$1,007,164 HKD. At least 12 retailers stock this exact specification. Half of all listings fall between HK$330,231 HKD and HK$366,370 HKD per carat. The same specification in lab grown form lists at a median of about HK$2,626 HKD 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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

HK$423,954 HKD

Highest Price

HK$4,642,268 HKD

Average Price

HK$1,303,027 HKD

Market Intelligence

Retailers Selling

Price Spread

10.5%

Price Range

Price per carat distribution across retailers

$43,803/ct

10th Percentile

$40,372

Median

$43,803

90th Percentile

$53,772

Score Distribution

67 diamonds scored across 4 quality tiers

Excellent

4 (6.0%)

Very Good

15 (22.4%)

Good

33 (49.3%)

Average

15 (22.4%)

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Lab-Grown D SI1Same specifications, lab-grown origin

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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