How much does a 3.00 to 4.99ct J SI1 natural marquise diamond cost?

As of November 2026, 3.00 to 4.99ct J SI1 natural marquise diamonds typically cost $37,517 CAD to $90,157 CAD, with a median price of $46,571 CAD. There are currently 20 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Natural Marquise

Quick answer

As of November 2026, there are 20 natural marquise diamonds with J color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $37,517 CAD to $90,157 CAD, with a median of $46,571 CAD. At least 40 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 42%. Half of all listings fall between $10,907 CAD and $17,247 CAD per carat. Over the last 30 days the median price moved +4.6% and the number of listings moved +8.5%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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: November 2026

Available

Lowest Price

$26,112 CAD

Highest Price

$95,297 CAD

Average Price

$53,071 CAD

Market Intelligence

Retailers Selling

Cross Retailer %

40.0%

Price Spread

42.3%

30-Day Price Trend

+4.6%

30-Day Supply Change

+8.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$10,727/ct

10th Percentile

$5,850

Median

$10,727

90th Percentile

$13,716

Score Distribution

37 diamonds scored across 4 quality tiers

Excellent

5 (13.5%)

Very Good

11 (29.7%)

Good

8 (21.6%)

Average

13 (35.1%)

Find Your Diamond

Search 20 J SI1 marquise diamonds and compare prices.

Search Diamonds

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 44%

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