How much does a 1.50 to 1.99ct H I1 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct H I1 natural round diamonds typically cost $3,676 AUD to $13,431 AUD, with a median price of $8,190 AUD. There are currently 284 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 62%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H I1 Natural Round

Quick answer

As of October 2026, there are 284 natural round diamonds with H colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $3,676 AUD to $13,431 AUD, with a median of $8,190 AUD. At least 29 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 62%. Half of all listings fall between $3,127 AUD and $5,877 AUD per carat. The same specification in lab grown form lists at a median of about $859 AUD per carat. Over the last 30 days the median price moved -6.7% and the number of listings moved +11.7%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

284

Lowest Price

$1,447 AUD

Highest Price

$27,142 AUD

Average Price

$8,437 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

27.4%

Price Spread

61.8%

30-Day Price Trend

-6.7%

30-Day Supply Change

+11.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,131/ct

10th Percentile

$1,510

Median

$3,131

90th Percentile

$5,161

Score Distribution

871 diamonds scored across 4 quality tiers

Excellent

74 (8.5%)

Very Good

177 (20.3%)

Good

154 (17.7%)

Average

466 (53.5%)

Find Your Diamond

Search 284 H I1 round diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown H I1Same specifications, lab-grown origin

Save 81%

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