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

As of October 2026, 5.00ct+ D SI1 natural cushion diamonds typically cost $76,937 USD to $338,873 USD, with a median price of $125,884 USD. There are currently 29 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 October 2026, there are 29 natural cushion diamonds with D color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $76,937 USD to $338,873 USD, with a median of $125,884 USD. The same specification in lab grown form lists at a median of about $387 USD 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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

$54,633 USD

Highest Price

$591,975 USD

Average Price

$169,570 USD

Score Distribution

58 diamonds scored across 4 quality tiers

Excellent

11 (19.0%)

Very Good

12 (20.7%)

Good

19 (32.8%)

Average

16 (27.6%)

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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