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

As of September 2026, 1.00 to 1.49ct I SI1 lab grown oval diamonds typically cost $750 USD to $2,118 USD, with a median price of $1,375 USD. There are currently 224 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI1 Lab Grown Oval

Quick answer

As of September 2026, there are 224 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 $750 USD to $2,118 USD, with a median of $1,375 USD. At least 20 retailers stock this exact specification. Half of all listings fall between $793 USD and $1,817 USD per carat. The same specification in natural form lists at a median of about $2,985 USD per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Oval lab grown stones in the index: 487 USD per carat, -11.2% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

224

Lowest Price

$278 USD

Highest Price

$9,225 USD

Average Price

$1,517 USD

Market Intelligence

Retailers Selling

Price Spread

76.7%

Price Range

Price per carat distribution across retailers

$1,335/ct

10th Percentile

$745

Median

$1,335

90th Percentile

$2,410

Score Distribution

224 diamonds scored across 4 quality tiers

Excellent

12 (5.4%)

Very Good

80 (35.7%)

Good

58 (25.9%)

Average

74 (33.0%)

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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