How much does a 1.50 to 1.99ct D I1 lab grown round diamond cost?

As of October 2026, 1.50 to 1.99ct D I1 lab grown round diamonds typically cost $264 AUD to $2,997 AUD, with a median price of $557 AUD. There are currently 9 diamonds matching this specification available across retailers.

Where can I find the best price on a D I1 round diamond?

About 48% of these diamonds are available at multiple retailers, with an average price spread of 141%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D I1 Lab Grown Round

Quick answer

As of October 2026, there are 9 lab grown round diamonds with D colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $264 AUD to $2,997 AUD, with a median of $557 AUD. At least 15 retailers stock this exact specification, and 48% of the stones appear at more than one of them, with an average price spread of 141%. Half of all listings fall between $227 AUD and $804 AUD per carat. The same specification in natural form lists at a median of about $5,882 AUD per carat. Over the last 30 days the median price moved -53.7% and the number of listings moved +9.5%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

$235 AUD

Highest Price

$3,623 AUD

Average Price

$1,276 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

48.3%

Price Spread

141.3%

30-Day Price Trend

-53.7%

30-Day Supply Change

+9.5%

Volatility (30d)

0.17

Price Range

Price per carat distribution across retailers

$287/ct

10th Percentile

$132

Median

$287

90th Percentile

$1,142

Score Distribution

13 diamonds scored across 3 quality tiers

Excellent

3 (23.1%)

Very Good

4 (30.8%)

Good

6 (46.2%)

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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