How much does a 0.50 to 0.74ct K SI1 natural marquise diamond cost?

As of November 6, 2026, 0.50 to 0.74ct K SI1 natural marquise diamonds typically cost $541 SGD to $1,601 SGD, with a median price of $838 SGD. There are currently 147 diamonds matching this specification available across retailers.

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

About 51% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct K SI1 Natural Marquise

Quick answer

As of November 6, 2026, there are 147 natural marquise diamonds with K colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $541 SGD to $1,601 SGD, with a median of $838 SGD. Half of all listings fall between $1,077 SGD and $1,844 SGD per carat. The same specification in lab grown form lists at a median of about $2,317 SGD per carat. Over the last 30 days the median price moved +1.1% and the number of listings moved +5.6%.

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

147

Lowest Price

$298 SGD

Highest Price

$3,059 SGD

Average Price

$960 SGD

Market Intelligence

Cross Retailer %

51.0%

Price Spread

54.7%

30-Day Price Trend

+1.1%

30-Day Supply Change

+5.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,098/ct

10th Percentile

$729

Median

$1,098

90th Percentile

$1,791

Score Distribution

147 diamonds scored across 4 quality tiers

Excellent

27 (18.4%)

Very Good

45 (30.6%)

Good

35 (23.8%)

Average

40 (27.2%)

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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