How much does a 1.50 to 1.99ct J SI1 natural marquise diamond cost?

As of November 2026, 1.50 to 1.99ct J SI1 natural marquise diamonds typically cost HK$34,484 HKD to HK$128,626 HKD, with a median price of HK$60,460 HKD. There are currently 90 diamonds matching this specification available across retailers.

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

About 39% 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.

1.50 to 1.99ct J SI1 Natural Marquise

Quick answer

As of November 2026, there are 90 natural marquise diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run HK$34,484 HKD to HK$128,626 HKD, with a median of HK$60,460 HKD. At least 53 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between HK$25,642 HKD and HK$42,966 HKD per carat. The same specification in lab grown form lists at a median of about HK$8,576 HKD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +22.7%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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: November 2026

Available

Lowest Price

HK$21,457 HKD

Highest Price

HK$171,437 HKD

Average Price

HK$68,238 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

39.5%

Price Spread

51.2%

30-Day Price Trend

-1.6%

30-Day Supply Change

+22.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,313/ct

10th Percentile

$2,348

Median

$4,313

90th Percentile

$6,613

Score Distribution

192 diamonds scored across 4 quality tiers

Excellent

14 (7.3%)

Very Good

41 (21.4%)

Good

47 (24.5%)

Average

90 (46.9%)

Find Your Diamond

Search 90 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 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