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

As of November 6, 2026, 1.50 to 1.99ct K SI1 lab grown oval diamonds typically cost $1,643 NZD to $2,993 NZD, with a median price of $1,963 NZD. There are currently 88 diamonds matching this specification available across retailers.

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

About 57% of these diamonds are available at multiple retailers, with an average price spread of 61%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct K SI1 Lab Grown Oval

Quick answer

As of November 6, 2026, there are 88 lab grown oval diamonds with K colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $1,643 NZD to $2,993 NZD, with a median of $1,963 NZD. Half of all listings fall between $1,092 NZD and $1,761 NZD per carat. The same specification in natural form lists at a median of about $4,485 NZD per carat. Over the last 30 days the median price moved -4.2% and the number of listings moved -1.8%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Oval lab grown stones in the index: 479 USD per carat, +3.3% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

Lowest Price

$1,643 NZD

Highest Price

$7,805 NZD

Average Price

$2,243 NZD

Market Intelligence

Cross Retailer %

56.8%

Price Spread

61.0%

30-Day Price Trend

-4.2%

30-Day Supply Change

-1.8%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$607/ct

10th Percentile

$605

Median

$607

90th Percentile

$980

Score Distribution

88 diamonds scored across 2 quality tiers

Excellent

50 (56.8%)

Good

38 (43.2%)

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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