How much does a 1.00 to 1.49ct I SI1 lab grown oval diamond cost?

As of October 2026, 1.00 to 1.49ct I SI1 lab grown oval diamonds typically cost $730 USD to $1,828 USD, with a median price of $770 USD. There are currently 69 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 74%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 69 lab grown oval diamonds with I color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $730 USD to $1,828 USD, with a median of $770 USD. At least 23 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 74%. Half of all listings fall between $994 USD and $1,842 USD per carat. The same specification in natural form lists at a median of about $3,064 USD per carat. Over the last 30 days the median price moved 0.0% and the number of listings moved -3.2%.

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. 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

$231 USD

Highest Price

$4,296 USD

Average Price

$1,243 USD

Market Intelligence

Retailers Selling

Cross Retailer %

42.4%

Price Spread

73.5%

30-Day Price Trend

0.0%

30-Day Supply Change

-3.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,153/ct

10th Percentile

$708

Median

$1,153

90th Percentile

$2,485

Score Distribution

131 diamonds scored across 4 quality tiers

Excellent

62 (47.3%)

Very Good

6 (4.6%)

Good

3 (2.3%)

Average

60 (45.8%)

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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