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

As of November 2026, 1.50 to 1.99ct D SI1 natural round diamonds typically cost €5,959 EUR to €17,363 EUR, with a median price of €9,639 EUR. There are currently 755 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 45%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Natural Round

Quick answer

As of November 2026, there are 755 natural round diamonds with D color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €5,959 EUR to €17,363 EUR, with a median of €9,639 EUR. At least 64 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 45%. Half of all listings fall between €4,886 EUR and €7,610 EUR per carat. The same specification in lab grown form lists at a median of about €353 EUR per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +11.9%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

755

Lowest Price

€3,455 EUR

Highest Price

€27,861 EUR

Average Price

€10,722 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

35.9%

Price Spread

45.5%

30-Day Price Trend

-1.1%

30-Day Supply Change

+11.9%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$6,696/ct

10th Percentile

$4,619

Median

$6,696

90th Percentile

$10,398

Score Distribution

1.9K diamonds scored across 4 quality tiers

Excellent

299 (16.1%)

Very Good

455 (24.6%)

Good

380 (20.5%)

Average

718 (38.8%)

Find Your Diamond

Search 755 D SI1 round diamonds and compare prices.

Search Diamonds

Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

Save 25%

Lab-Grown D SI1Same specifications, lab-grown origin

Save 94%

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