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

As of November 2026, 3.00 to 4.99ct J SI1 natural marquise diamonds typically cost HK$210,680 HKD to HK$506,394 HKD, with a median price of HK$259,808 HKD. There are currently 20 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 31%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Natural Marquise

Quick answer

As of November 2026, there are 20 natural marquise diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$210,680 HKD to HK$506,394 HKD, with a median of HK$259,808 HKD. At least 40 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 31%. Half of all listings fall between HK$64,103 HKD and HK$90,153 HKD per carat. Over the last 30 days the median price moved +4.8% and the number of listings moved +9.3%.

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$146,668 HKD

Highest Price

HK$535,261 HKD

Average Price

HK$297,956 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

40.0%

Price Spread

31.1%

30-Day Price Trend

+4.8%

30-Day Supply Change

+9.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$10,676/ct

10th Percentile

$5,832

Median

$10,676

90th Percentile

$12,872

Score Distribution

37 diamonds scored across 4 quality tiers

Excellent

6 (16.2%)

Very Good

10 (27.0%)

Good

8 (21.6%)

Average

13 (35.1%)

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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