How much does a 1.50 to 1.99ct K SI2 natural marquise diamond cost?

As of November 6, 2026, 1.50 to 1.99ct K SI2 natural marquise diamonds typically cost HK$19,327 HKD to HK$50,998 HKD, with a median price of HK$33,035 HKD. There are currently 195 diamonds matching this specification available across retailers.

Where can I find the best price on a K SI2 marquise diamond?

About 50% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct K SI2 Natural Marquise

Quick answer

As of November 6, 2026, there are 195 natural marquise diamonds with K colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run HK$19,327 HKD to HK$50,998 HKD, with a median of HK$33,035 HKD. Half of all listings fall between HK$15,724 HKD and HK$27,850 HKD per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +19.8%.

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 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

195

Lowest Price

HK$14,620 HKD

Highest Price

HK$121,096 HKD

Average Price

HK$34,718 HKD

Market Intelligence

Cross Retailer %

49.7%

Price Spread

56.7%

30-Day Price Trend

-1.2%

30-Day Supply Change

+19.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,730/ct

10th Percentile

$1,614

Median

$2,730

90th Percentile

$4,161

Score Distribution

195 diamonds scored across 4 quality tiers

Excellent

44 (22.6%)

Very Good

75 (38.5%)

Good

42 (21.5%)

Average

34 (17.4%)

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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