How much does a 1.00 to 1.49ct K SI2 natural round diamond cost?

As of November 6, 2026, 1.00 to 1.49ct K SI2 natural round diamonds typically cost $1,178 USD to $3,526 USD, with a median price of $1,957 USD. There are currently 1,762 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct K SI2 Natural Round

Quick answer

As of November 6, 2026, there are 1,762 natural round diamonds with K color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,178 USD to $3,526 USD, with a median of $1,957 USD. Half of all listings fall between $1,377 USD and $2,397 USD per carat. The same specification in lab grown form lists at a median of about $1,090 USD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +1.4%.

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

1,762

Lowest Price

$614 USD

Highest Price

$7,634 USD

Average Price

$2,192 USD

Market Intelligence

Cross Retailer %

38.5%

Price Spread

57.1%

30-Day Price Trend

-0.4%

30-Day Supply Change

+1.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,786/ct

10th Percentile

$1,120

Median

$1,786

90th Percentile

$3,288

Score Distribution

1.8K diamonds scored across 4 quality tiers

Excellent

359 (20.4%)

Very Good

465 (26.4%)

Good

257 (14.6%)

Average

681 (38.6%)

Find Your Diamond

Search 1,762 K SI2 round diamonds and compare prices.

Search Diamonds

Consider Instead

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

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