How much does a 1.00 to 1.49ct J I1 natural round diamond cost?

As of September 2026, 1.00 to 1.49ct J I1 natural round diamonds typically cost $1,328 SGD to $3,883 SGD, with a median price of $2,290 SGD. There are currently 1,083 diamonds matching this specification available across retailers.

Where can I find the best price on a J I1 round diamond?

About 59% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J I1 Natural Round

Quick answer

As of September 2026, there are 1,083 natural round diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,328 SGD to $3,883 SGD, with a median of $2,290 SGD. At least 27 retailers stock this exact specification, and 59% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $1,603 SGD and $2,646 SGD per carat. The same specification in lab grown form lists at a median of about $2,577 SGD per carat. Over the last 30 days the median price moved -4.0% and the number of listings moved +11.8%.

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 natural stones in the index: 2,094 USD per carat, -3.8% 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

1,083

Lowest Price

$780 SGD

Highest Price

$12,448 SGD

Average Price

$2,517 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

59.0%

Price Spread

50.7%

30-Day Price Trend

-4.0%

30-Day Supply Change

+11.8%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,624/ct

10th Percentile

$990

Median

$1,624

90th Percentile

$2,683

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

52 (4.8%)

Very Good

338 (31.2%)

Good

290 (26.8%)

Average

403 (37.2%)

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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