How much does a 1.00 to 1.49ct D SI1 lab grown round diamond cost?

As of October 2026, 1.00 to 1.49ct D SI1 lab grown round diamonds typically cost $150 USD to $962 USD, with a median price of $374 USD. There are currently 1,001 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 98%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct D SI1 Lab Grown Round

Quick answer

As of October 2026, there are 1,001 lab grown round diamonds with D color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $150 USD to $962 USD, with a median of $374 USD. At least 41 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 98%. Half of all listings fall between $193 USD and $552 USD per carat. The same specification in natural form lists at a median of about $4,353 USD per carat. Over the last 30 days the median price moved -3.0% and the number of listings moved +5.7%.

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

1,001

Lowest Price

$119 USD

Highest Price

$2,280 USD

Average Price

$500 USD

Market Intelligence

Retailers Selling

Cross Retailer %

36.3%

Price Spread

97.8%

30-Day Price Trend

-3.0%

30-Day Supply Change

+5.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$367/ct

10th Percentile

$158

Median

$367

90th Percentile

$821

Score Distribution

2.4K diamonds scored across 4 quality tiers

Excellent

646 (27.2%)

Very Good

391 (16.5%)

Good

594 (25.0%)

Average

742 (31.3%)

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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