How much does a 1.00 to 1.49ct J SI1 natural marquise diamond cost?

As of November 6, 2026, 1.00 to 1.49ct J SI1 natural marquise diamonds typically cost $2,243 SGD to $6,754 SGD, with a median price of $3,557 SGD. There are currently 576 diamonds matching this specification available across retailers.

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

About 36% 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.

1.00 to 1.49ct J SI1 Natural Marquise

Quick answer

As of November 6, 2026, there are 576 natural marquise diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,243 SGD to $6,754 SGD, with a median of $3,557 SGD. Half of all listings fall between $2,619 SGD and $4,436 SGD per carat. The same specification in lab grown form lists at a median of about $2,649 SGD per carat. Over the last 30 days the median price moved +0.7% and the number of listings moved +14.7%.

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 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

576

Lowest Price

$1,465 SGD

Highest Price

$16,128 SGD

Average Price

$4,171 SGD

Market Intelligence

Cross Retailer %

36.1%

Price Spread

54.6%

30-Day Price Trend

+0.7%

30-Day Supply Change

+14.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,596/ct

10th Percentile

$1,644

Median

$2,596

90th Percentile

$4,638

Score Distribution

576 diamonds scored across 4 quality tiers

Excellent

58 (10.1%)

Very Good

131 (22.7%)

Good

132 (22.9%)

Average

255 (44.3%)

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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