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

As of October 2026, 1.50 to 1.99ct J SI1 natural cushion diamonds typically cost $2,670 USD to $7,148 USD, with a median price of $4,330 USD. There are currently 391 diamonds matching this specification available across retailers.

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

About 36% 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 J SI1 Natural Cushion

Quick answer

As of October 2026, there are 391 natural cushion diamonds with J color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $2,670 USD to $7,148 USD, with a median of $4,330 USD. At least 56 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between $2,066 USD and $3,540 USD per carat. The same specification in lab grown form lists at a median of about $1,071 USD per carat. Over the last 30 days the median price moved -0.0% and the number of listings moved +8.0%.

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

391

Lowest Price

$1,763 USD

Highest Price

$13,305 USD

Average Price

$4,686 USD

Market Intelligence

Retailers Selling

Cross Retailer %

36.1%

Price Spread

54.6%

30-Day Price Trend

-0.0%

30-Day Supply Change

+8.0%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,702/ct

10th Percentile

$1,679

Median

$2,702

90th Percentile

$4,454

Score Distribution

995 diamonds scored across 4 quality tiers

Excellent

152 (15.3%)

Very Good

177 (17.8%)

Good

238 (23.9%)

Average

428 (43.0%)

Find Your Diamond

Search 391 J SI1 cushion diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI2SI2 inclusions are not visible without magnification

Save 9%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 60%

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