How much does a 1.50 to 1.99ct D SI1 natural marquise diamond cost?

As of October 2026, 1.50 to 1.99ct D SI1 natural marquise diamonds typically cost $12,060 SGD to $31,352 SGD, with a median price of $16,054 SGD. There are currently 117 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Natural Marquise

Quick answer

As of October 2026, there are 117 natural marquise diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $12,060 SGD to $31,352 SGD, with a median of $16,054 SGD. At least 62 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between $9,136 SGD and $12,622 SGD per carat. The same specification in lab grown form lists at a median of about $534 SGD per carat. Over the last 30 days the median price moved -0.7% and the number of listings moved +13.2%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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: October 2026

Available

117

Lowest Price

$8,633 SGD

Highest Price

$40,819 SGD

Average Price

$18,718 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

31.0%

Price Spread

32.8%

30-Day Price Trend

-0.7%

30-Day Supply Change

+13.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$8,302/ct

10th Percentile

$6,356

Median

$8,302

90th Percentile

$11,953

Score Distribution

270 diamonds scored across 4 quality tiers

Excellent

34 (12.6%)

Very Good

68 (25.2%)

Good

67 (24.8%)

Average

101 (37.4%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same specifications, lab-grown origin

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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