How much does a 1.00 to 1.49ct D SI1 natural round diamond cost?

As of September 2026, 1.00 to 1.49ct D SI1 natural round diamonds typically cost $3,409 SGD to $8,886 SGD, with a median price of $5,157 SGD. There are currently 3,857 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct D SI1 Natural Round

Quick answer

As of September 2026, there are 3,857 natural round diamonds with D colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $3,409 SGD to $8,886 SGD, with a median of $5,157 SGD. At least 68 retailers stock this exact specification. Half of all listings fall between $4,065 SGD and $5,842 SGD per carat. The same specification in lab grown form lists at a median of about $520 SGD per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round natural stones in the index: 2,094 USD per carat, -3.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

3,857

Lowest Price

$953 SGD

Highest Price

$42,018 SGD

Average Price

$5,701 SGD

Market Intelligence

Retailers Selling

Price Spread

36.8%

Price Range

Price per carat distribution across retailers

$3,619/ct

10th Percentile

$2,572

Median

$3,619

90th Percentile

$5,510

Score Distribution

3.9K diamonds scored across 4 quality tiers

Excellent

541 (14.0%)

Very Good

1,209 (31.3%)

Good

1,291 (33.5%)

Average

816 (21.2%)

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

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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