How much does a 1.00 to 1.49ct D SI1 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct D SI1 natural cushion diamonds typically cost $2,523 AUD to $7,718 AUD, with a median price of $3,944 AUD. There are currently 764 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct D SI1 Natural Cushion

Quick answer

As of September 2026, there are 764 natural cushion diamonds with D colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,523 AUD to $7,718 AUD, with a median of $3,944 AUD. At least 57 retailers stock this exact specification. Half of all listings fall between $2,905 AUD and $5,081 AUD per carat. The same specification in lab grown form lists at a median of about $556 AUD 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

764

Lowest Price

$948 AUD

Highest Price

$13,538 AUD

Average Price

$4,545 AUD

Market Intelligence

Retailers Selling

Price Spread

58.0%

Price Range

Price per carat distribution across retailers

$2,692/ct

10th Percentile

$1,793

Median

$2,692

90th Percentile

$4,683

Score Distribution

764 diamonds scored across 4 quality tiers

Excellent

110 (14.4%)

Very Good

205 (26.8%)

Good

261 (34.2%)

Average

188 (24.6%)

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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