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

As of November 6, 2026, 1.50 to 1.99ct N SI1 natural round diamonds typically cost HK$16,098 HKD to HK$35,803 HKD, with a median price of HK$21,441 HKD. There are currently 135 diamonds matching this specification available across retailers.

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

About 65% 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 N SI1 Natural Round

Quick answer

As of November 6, 2026, there are 135 natural round diamonds with N colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run HK$16,098 HKD to HK$35,803 HKD, with a median of HK$21,441 HKD. Half of all listings fall between HK$12,160 HKD and HK$17,276 HKD per carat. Over the last 30 days the median price moved -2.1% and the number of listings moved +22.2%.

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

135

Lowest Price

HK$11,627 HKD

Highest Price

HK$73,462 HKD

Average Price

HK$23,954 HKD

Market Intelligence

Cross Retailer %

65.2%

Price Spread

36.5%

30-Day Price Trend

-2.1%

30-Day Supply Change

+22.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,787/ct

10th Percentile

$1,366

Median

$1,787

90th Percentile

$2,944

Score Distribution

135 diamonds scored across 4 quality tiers

Excellent

12 (8.9%)

Very Good

51 (37.8%)

Good

53 (39.3%)

Average

19 (14.1%)

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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