How much does a 1.50 to 1.99ct M SI1 natural round diamond cost?

As of November 6, 2026, 1.50 to 1.99ct M SI1 natural round diamonds typically cost $2,649 SGD to $5,930 SGD, with a median price of $3,838 SGD. There are currently 531 diamonds matching this specification available across retailers.

Where can I find the best price on a M SI1 round diamond?

About 63% of these diamonds are available at multiple retailers, with an average price spread of 36%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct M SI1 Natural Round

Quick answer

As of November 6, 2026, there are 531 natural round diamonds with M colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $2,649 SGD to $5,930 SGD, with a median of $3,838 SGD. Half of all listings fall between $2,026 SGD and $2,918 SGD per carat. The same specification in lab grown form lists at a median of about $641 SGD per carat. Over the last 30 days the median price moved +3.9% and the number of listings moved +21.0%.

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. Round natural stones in the index: 2,124 USD per carat, -6.9% 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

531

Lowest Price

$1,315 SGD

Highest Price

$13,640 SGD

Average Price

$4,104 SGD

Market Intelligence

Cross Retailer %

62.9%

Price Spread

36.2%

30-Day Price Trend

+3.9%

30-Day Supply Change

+21.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,928/ct

10th Percentile

$1,349

Median

$1,928

90th Percentile

$2,828

Score Distribution

531 diamonds scored across 4 quality tiers

Excellent

99 (18.6%)

Very Good

187 (35.2%)

Good

162 (30.5%)

Average

83 (15.6%)

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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