How much does a 1.50 to 1.99ct I SI2 lab grown oval diamond cost?

As of October 2026, 1.50 to 1.99ct I SI2 lab grown oval diamonds typically cost $1,407 NZD to $3,945 NZD, with a median price of $1,901 NZD. There are currently 136 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 oval diamond?

About 51% of these diamonds are available at multiple retailers, with an average price spread of 91%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Lab Grown Oval

Quick answer

As of October 2026, there are 136 lab grown oval diamonds with I colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $1,407 NZD to $3,945 NZD, with a median of $1,901 NZD. At least 15 retailers stock this exact specification, and 51% of the stones appear at more than one of them, with an average price spread of 91%. Half of all listings fall between $1,440 NZD and $2,852 NZD per carat. The same specification in natural form lists at a median of about $6,544 NZD per carat. Over the last 30 days the median price moved -1.0% and the number of listings moved -0.5%.

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

136

Lowest Price

$614 NZD

Highest Price

$9,079 NZD

Average Price

$2,599 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

51.3%

Price Spread

90.8%

30-Day Price Trend

-1.0%

30-Day Supply Change

-0.5%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$874/ct

10th Percentile

$740

Median

$874

90th Percentile

$1,785

Score Distribution

260 diamonds scored across 4 quality tiers

Excellent

131 (50.4%)

Very Good

6 (2.3%)

Good

66 (25.4%)

Average

57 (21.9%)

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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