How much does a 1.50 to 1.99ct D SI1 natural cushion diamond cost?

As of October 2026, 1.50 to 1.99ct D SI1 natural cushion diamonds typically cost €4,223 EUR to €13,746 EUR, with a median price of €7,799 EUR. There are currently 175 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Natural Cushion

Quick answer

As of October 2026, there are 175 natural cushion diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €4,223 EUR to €13,746 EUR, with a median of €7,799 EUR. At least 58 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between €3,457 EUR and €5,958 EUR per carat. The same specification in lab grown form lists at a median of about €383 EUR per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +4.8%.

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

175

Lowest Price

€2,587 EUR

Highest Price

€22,697 EUR

Average Price

€8,445 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

27.3%

Price Spread

55.0%

30-Day Price Trend

-2.5%

30-Day Supply Change

+4.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,067/ct

10th Percentile

$3,013

Median

$5,067

90th Percentile

$8,232

Score Distribution

564 diamonds scored across 4 quality tiers

Excellent

76 (13.5%)

Very Good

96 (17.0%)

Good

150 (26.6%)

Average

242 (42.9%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

D SI2SI2 inclusions are not visible without magnification

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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