How much does a 0.50 to 0.74ct D SI1 lab grown round diamond cost?

As of October 2026, 0.50 to 0.74ct D SI1 lab grown round diamonds typically cost €103 EUR to €665 EUR, with a median price of €234 EUR. There are currently 478 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 103%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct D SI1 Lab Grown Round

Quick answer

As of October 2026, there are 478 lab grown round diamonds with D color and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run €103 EUR to €665 EUR, with a median of €234 EUR. At least 36 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 103%. Half of all listings fall between €287 EUR and €752 EUR per carat. The same specification in natural form lists at a median of about €1,699 EUR per carat. Over the last 30 days the median price moved -6.5% and the number of listings moved -1.0%.

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 lab grown stones in the index: 414 USD per carat, -5.0% 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: October 2026

Available

478

Lowest Price

€66 EUR

Highest Price

€1,762 EUR

Average Price

€316 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

38.8%

Price Spread

103.0%

30-Day Price Trend

-6.5%

30-Day Supply Change

-1.0%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$504/ct

10th Percentile

$208

Median

$504

90th Percentile

$1,557

Score Distribution

921 diamonds scored across 4 quality tiers

Excellent

289 (31.4%)

Very Good

237 (25.7%)

Good

164 (17.8%)

Average

231 (25.1%)

Find Your Diamond

Search 478 D SI1 round diamonds and compare prices.

Search Diamonds

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