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

As of October 2026, 3.00 to 4.99ct D SI1 natural marquise diamonds typically cost $59,699 CAD to $118,957 CAD, with a median price of $78,609 CAD. There are currently 48 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 22%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI1 Natural Marquise

Quick answer

As of October 2026, there are 48 natural marquise diamonds with D color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $59,699 CAD to $118,957 CAD, with a median of $78,609 CAD. At least 53 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 22%. Half of all listings fall between $23,027 CAD and $28,590 CAD per carat. The same specification in lab grown form lists at a median of about $594 CAD per carat. Over the last 30 days the median price moved -0.1% and the number of listings moved +7.9%.

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. 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: October 2026

Available

Lowest Price

$51,935 CAD

Highest Price

$237,653 CAD

Average Price

$86,035 CAD

Market Intelligence

Retailers Selling

Cross Retailer %

40.0%

Price Spread

21.8%

30-Day Price Trend

-0.1%

30-Day Supply Change

+7.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$18,307/ct

10th Percentile

$15,117

Median

$18,307

90th Percentile

$23,236

Score Distribution

105 diamonds scored across 4 quality tiers

Excellent

13 (12.4%)

Very Good

37 (35.2%)

Good

29 (27.6%)

Average

26 (24.8%)

Find Your Diamond

Search 48 D 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.

D SI2SI2 inclusions are not visible without magnification

Save 21%

Lab-Grown D SI1Same specifications, lab-grown origin

Save 98%

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