How much does a 0.75 to 0.99ct H SI1 natural marquise diamond cost?

As of October 2026, 0.75 to 0.99ct H SI1 natural marquise diamonds typically cost $2,235 CAD to $5,243 CAD, with a median price of $3,394 CAD. There are currently 60 diamonds matching this specification available across retailers.

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

About 24% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct H SI1 Natural Marquise

Quick answer

As of October 2026, there are 60 natural marquise diamonds with H color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $2,235 CAD to $5,243 CAD, with a median of $3,394 CAD. At least 59 retailers stock this exact specification, and 24% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between $2,673 CAD and $4,390 CAD per carat. The same specification in lab grown form lists at a median of about $797 CAD per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +10.6%.

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

$935 CAD

Highest Price

$8,204 CAD

Average Price

$3,567 CAD

Market Intelligence

Retailers Selling

Cross Retailer %

23.8%

Price Spread

50.3%

30-Day Price Trend

+0.4%

30-Day Supply Change

+10.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,447/ct

10th Percentile

$1,558

Median

$2,447

90th Percentile

$4,225

Score Distribution

198 diamonds scored across 4 quality tiers

Excellent

12 (6.1%)

Very Good

16 (8.1%)

Good

46 (23.2%)

Average

124 (62.6%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI2SI2 inclusions are not visible without magnification

Save 18%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 77%

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