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

As of October 2026, 1.00 to 1.49ct J SI1 natural radiant diamonds typically cost $2,060 CAD to $5,955 CAD, with a median price of $3,330 CAD. There are currently 205 diamonds matching this specification available across retailers.

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

About 38% 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 SI1 Natural Radiant

Quick answer

As of October 2026, there are 205 natural radiant diamonds with J color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,060 CAD to $5,955 CAD, with a median of $3,330 CAD. At least 58 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $2,225 CAD and $3,627 CAD per carat. The same specification in lab grown form lists at a median of about $676 CAD per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +20.0%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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

205

Lowest Price

$1,340 CAD

Highest Price

$11,920 CAD

Average Price

$3,681 CAD

Market Intelligence

Retailers Selling

Cross Retailer %

37.9%

Price Spread

51.2%

30-Day Price Trend

-1.3%

30-Day Supply Change

+20.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,955/ct

10th Percentile

$1,321

Median

$1,955

90th Percentile

$3,524

Score Distribution

641 diamonds scored across 4 quality tiers

Excellent

66 (10.3%)

Very Good

123 (19.2%)

Good

137 (21.4%)

Average

315 (49.1%)

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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 14%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 75%

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