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

As of November 2026, 1.50 to 1.99ct I SI2 natural radiant diamonds typically cost €2,934 EUR to €8,189 EUR, with a median price of €5,258 EUR. There are currently 173 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Natural Radiant

Quick answer

As of November 2026, there are 173 natural radiant diamonds with I color and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €2,934 EUR to €8,189 EUR, with a median of €5,258 EUR. At least 55 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 48%. Half of all listings fall between €2,603 EUR and €4,240 EUR per carat. The same specification in lab grown form lists at a median of about €1,151 EUR per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +14.2%.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Radiant natural stones in the index: 3,091 USD per carat, +13.2% month on month. See the full index release

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

Last updated: November 2026

Available

173

Lowest Price

€1,879 EUR

Highest Price

€15,049 EUR

Average Price

€5,454 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

34.1%

Price Spread

48.1%

30-Day Price Trend

-0.4%

30-Day Supply Change

+14.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,803/ct

10th Percentile

$2,321

Median

$3,803

90th Percentile

$5,819

Score Distribution

506 diamonds scored across 4 quality tiers

Excellent

103 (20.4%)

Very Good

93 (18.4%)

Good

91 (18.0%)

Average

219 (43.3%)

Find Your Diamond

Search 173 I SI2 radiant diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI2J colour is visually identical to I to the naked eye

Save 25%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 66%

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