How much does a 1.50 to 1.99ct G SI1 lab grown oval diamond cost?

As of October 2026, 1.50 to 1.99ct G SI1 lab grown oval diamonds typically cost $499 USD to $1,340 USD, with a median price of $736 USD. There are currently 40 diamonds matching this specification available across retailers.

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

About 14% of these diamonds are available at multiple retailers, with an average price spread of 87%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 40 lab grown oval diamonds with G color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $499 USD to $1,340 USD, with a median of $736 USD. At least 35 retailers stock this exact specification, and 14% of the stones appear at more than one of them, with an average price spread of 87%. Half of all listings fall between $314 USD and $739 USD per carat. The same specification in natural form lists at a median of about $5,911 USD per carat. Over the last 30 days the median price moved +1.7% and the number of listings moved +15.9%.

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

$158 USD

Highest Price

$3,626 USD

Average Price

$922 USD

Market Intelligence

Retailers Selling

Cross Retailer %

14.3%

Price Spread

87.5%

30-Day Price Trend

+1.7%

30-Day Supply Change

+15.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$486/ct

10th Percentile

$190

Median

$486

90th Percentile

$1,043

Score Distribution

148 diamonds scored across 4 quality tiers

Excellent

10 (6.8%)

Very Good

16 (10.8%)

Good

68 (45.9%)

Average

54 (36.5%)

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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