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

As of October 2026, 1.00 to 1.49ct J SI1 natural round diamonds typically cost $2,173 SGD to $6,163 SGD, with a median price of $3,327 SGD. There are currently 1,879 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI1 Natural Round

Quick answer

As of October 2026, there are 1,879 natural round diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,173 SGD to $6,163 SGD, with a median of $3,327 SGD. At least 63 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between $2,266 SGD and $3,538 SGD per carat. The same specification in lab grown form lists at a median of about $1,215 SGD per carat. Over the last 30 days the median price moved -1.8% and the number of listings moved +1.9%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

1,879

Lowest Price

$1,063 SGD

Highest Price

$12,111 SGD

Average Price

$3,776 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

35.6%

Price Spread

46.6%

30-Day Price Trend

-1.8%

30-Day Supply Change

+1.9%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,132/ct

10th Percentile

$1,485

Median

$2,132

90th Percentile

$3,866

Score Distribution

4.7K diamonds scored across 4 quality tiers

Excellent

597 (12.6%)

Very Good

1,162 (24.6%)

Good

1,077 (22.8%)

Average

1,888 (40.0%)

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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 11%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 43%

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