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

As of September 2026, 1.00 to 1.49ct J SI1 lab grown round diamonds typically cost $1,867 SGD to $2,539 SGD, with a median price of $1,908 SGD. There are currently 1,100 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct J SI1 Lab Grown Round

Quick answer

As of September 2026, there are 1,100 lab grown round diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,867 SGD to $2,539 SGD, with a median of $1,908 SGD. At least 22 retailers stock this exact specification. Half of all listings fall between $1,841 SGD and $2,397 SGD per carat. The same specification in natural form lists at a median of about $2,991 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. Round lab grown stones in the index: 438 USD per carat, -14.1% 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

1,100

Lowest Price

$264 SGD

Highest Price

$13,393 SGD

Average Price

$2,144 SGD

Market Intelligence

Retailers Selling

Price Spread

29.9%

Price Range

Price per carat distribution across retailers

$1,392/ct

10th Percentile

$1,378

Median

$1,392

90th Percentile

$2,906

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

26 (2.4%)

Very Good

754 (68.5%)

Good

251 (22.8%)

Average

69 (6.3%)

Find Your Diamond

Search 1,100 J SI1 round diamonds and compare prices.

Search Diamonds

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