How much does a 1.00 to 1.49ct I SI2 natural marquise diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 natural marquise diamonds typically cost HK$10,978 HKD to HK$35,331 HKD, with a median price of HK$19,500 HKD. There are currently 1,099 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI2 Natural Marquise

Quick answer

As of September 2026, there are 1,099 natural marquise diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run HK$10,978 HKD to HK$35,331 HKD, with a median of HK$19,500 HKD. At least 52 retailers stock this exact specification. Half of all listings fall between HK$15,765 HKD and HK$25,072 HKD per carat. The same specification in lab grown form lists at a median of about HK$13,483 HKD per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Marquise natural stones in the index: 2,114 USD per carat, -8.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

1,099

Lowest Price

HK$5,569 HKD

Highest Price

HK$84,500 HKD

Average Price

HK$21,577 HKD

Market Intelligence

Retailers Selling

Price Spread

46.1%

Price Range

Price per carat distribution across retailers

$2,624/ct

10th Percentile

$1,615

Median

$2,624

90th Percentile

$3,980

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

118 (10.7%)

Very Good

328 (29.9%)

Good

366 (33.3%)

Average

286 (26.0%)

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Consider Instead

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

J SI2J colour is visually identical to I to the naked eye

Save 19%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 32%

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