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 $3,414 SGD to $9,135 SGD, with a median price of $5,531 SGD. There are currently 393 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 393 natural cushion diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $3,414 SGD to $9,135 SGD, with a median of $5,531 SGD. 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 $2,641 SGD and $4,526 SGD per carat. The same specification in lab grown form lists at a median of about $1,369 SGD 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

393

Lowest Price

$2,254 SGD

Highest Price

$17,008 SGD

Average Price

$5,983 SGD

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

996 diamonds scored across 4 quality tiers

Excellent

152 (15.3%)

Very Good

180 (18.1%)

Good

237 (23.8%)

Average

427 (42.9%)

Find Your Diamond

Search 393 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