How much does a 0.50 to 0.74ct D SI1 lab grown oval diamond cost?

As of October 2026, 0.50 to 0.74ct D SI1 lab grown oval diamonds typically cost $186 NZD to $1,031 NZD, with a median price of $683 NZD. There are currently 120 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 70%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct D SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 120 lab grown oval diamonds with D colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $186 NZD to $1,031 NZD, with a median of $683 NZD. At least 34 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 70%. Half of all listings fall between $642 NZD and $1,470 NZD per carat. The same specification in natural form lists at a median of about $3,027 NZD per carat. Over the last 30 days the median price moved -0.9% and the number of listings moved +8.7%.

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

120

Lowest Price

$144 NZD

Highest Price

$2,823 NZD

Average Price

$650 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

29.5%

Price Spread

70.4%

30-Day Price Trend

-0.9%

30-Day Supply Change

+8.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$661/ct

10th Percentile

$217

Median

$661

90th Percentile

$1,376

Score Distribution

245 diamonds scored across 4 quality tiers

Excellent

51 (20.8%)

Very Good

31 (12.7%)

Good

73 (29.8%)

Average

90 (36.7%)

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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