How much does a 1.50 to 1.99ct K SI2 natural radiant diamond cost?

As of November 6, 2026, 1.50 to 1.99ct K SI2 natural radiant diamonds typically cost $2,830 SGD to $8,325 SGD, with a median price of $4,894 SGD. There are currently 137 diamonds matching this specification available across retailers.

Where can I find the best price on a K SI2 radiant diamond?

About 42% of these diamonds are available at multiple retailers, with an average price spread of 63%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct K SI2 Natural Radiant

Quick answer

As of November 6, 2026, there are 137 natural radiant diamonds with K colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $2,830 SGD to $8,325 SGD, with a median of $4,894 SGD. Half of all listings fall between $2,231 SGD and $4,154 SGD per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved +20.7%.

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. Radiant natural stones in the index: 3,108 USD per carat, +0.3% 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

137

Lowest Price

$1,962 SGD

Highest Price

$17,666 SGD

Average Price

$5,258 SGD

Market Intelligence

Cross Retailer %

42.3%

Price Spread

62.8%

30-Day Price Trend

-1.7%

30-Day Supply Change

+20.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,390/ct

10th Percentile

$1,466

Median

$2,390

90th Percentile

$3,987

Score Distribution

137 diamonds scored across 4 quality tiers

Excellent

24 (17.5%)

Very Good

41 (29.9%)

Good

22 (16.1%)

Average

50 (36.5%)

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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