How much does a 0.75 to 0.99ct H SI1 lab grown oval diamond cost?

As of October 2026, 0.75 to 0.99ct H SI1 lab grown oval diamonds typically cost $462 USD to $2,896 USD, with a median price of $1,461 USD. There are currently 12 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 132%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct H SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 12 lab grown oval diamonds with H color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $462 USD to $2,896 USD, with a median of $1,461 USD. At least 17 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 132%. Half of all listings fall between $919 USD and $2,331 USD per carat. The same specification in natural form lists at a median of about $1,780 USD per carat. Over the last 30 days the median price moved -4.6% and the number of listings moved -4.0%.

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. 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

$442 USD

Highest Price

$3,726 USD

Average Price

$1,487 USD

Market Intelligence

Retailers Selling

Cross Retailer %

35.9%

Price Spread

131.8%

30-Day Price Trend

-4.6%

30-Day Supply Change

-4.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,071/ct

10th Percentile

$698

Median

$1,071

90th Percentile

$3,205

Score Distribution

17 diamonds scored across 4 quality tiers

Excellent

3 (17.6%)

Very Good

3 (17.6%)

Good

1 (5.9%)

Average

10 (58.8%)

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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