How much does a 0.20 to 0.49ct I SI1 lab grown oval diamond cost?

As of October 2026, 0.20 to 0.49ct I SI1 lab grown oval diamonds typically cost $134 USD to $384 USD, with a median price of $216 USD. There are currently 5 diamonds matching this specification available across retailers.

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

About 57% of these diamonds are available at multiple retailers, with an average price spread of 95%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 5 lab grown oval diamonds with I color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $134 USD to $384 USD, with a median of $216 USD. At least 10 retailers stock this exact specification, and 57% of the stones appear at more than one of them, with an average price spread of 95%. Half of all listings fall between $493 USD and $1,065 USD per carat. The same specification in natural form lists at a median of about $1,228 USD per carat. Over the last 30 days the median price moved -0.7% and the number of listings moved -9.7%.

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. Oval lab grown stones in the index: 453 USD per carat, -7.4% 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

Lowest Price

$119 USD

Highest Price

$832 USD

Average Price

$251 USD

Market Intelligence

Retailers Selling

Cross Retailer %

57.1%

Price Spread

94.7%

30-Day Price Trend

-0.7%

30-Day Supply Change

-9.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$605/ct

10th Percentile

$455

Median

$605

90th Percentile

$1,897

Score Distribution

8 diamonds scored across 3 quality tiers

Very Good

3 (37.5%)

Good

2 (25.0%)

Average

3 (37.5%)

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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