How much does a 1.00 to 1.49ct J SI1 lab grown cushion diamond cost?

As of September 2026, 1.00 to 1.49ct J SI1 lab grown cushion diamonds typically cost $1,789 SGD to $2,599 SGD, with a median price of $1,845 SGD. There are currently 413 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI1 Lab Grown Cushion

Quick answer

As of September 2026, there are 413 lab grown cushion diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,789 SGD to $2,599 SGD, with a median of $1,845 SGD. At least 10 retailers stock this exact specification. Half of all listings fall between $1,756 SGD and $1,771 SGD per carat. The same specification in natural form lists at a median of about $2,491 SGD 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 lab grown stones in the index: 466 USD per carat, -14.7% 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

413

Lowest Price

$822 SGD

Highest Price

$5,325 SGD

Average Price

$2,074 SGD

Market Intelligence

Retailers Selling

Price Spread

0.9%

Price Range

Price per carat distribution across retailers

$1,389/ct

10th Percentile

$1,369

Median

$1,389

90th Percentile

$1,499

Score Distribution

413 diamonds scored across 4 quality tiers

Excellent

2 (0.5%)

Very Good

2 (0.5%)

Good

342 (82.8%)

Average

67 (16.2%)

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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