How much does a 0.75 to 0.99ct D I1 natural round diamond cost?

As of October 2026, 0.75 to 0.99ct D I1 natural round diamonds typically cost $1,346 AUD to $4,156 AUD, with a median price of $2,434 AUD. There are currently 105 diamonds matching this specification available across retailers.

Where can I find the best price on a D 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.

0.75 to 0.99ct D I1 Natural Round

Quick answer

As of October 2026, there are 105 natural round diamonds with D colour and I1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,346 AUD to $4,156 AUD, with a median of $2,434 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 $1,879 AUD and $3,376 AUD per carat. Over the last 30 days the median price moved -6.5% and the number of listings moved +8.0%.

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

105

Lowest Price

$961 AUD

Highest Price

$6,966 AUD

Average Price

$2,662 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

27.0%

Price Spread

61.7%

30-Day Price Trend

-6.5%

30-Day Supply Change

+8.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,704/ct

10th Percentile

$1,088

Median

$1,704

90th Percentile

$3,353

Score Distribution

300 diamonds scored across 4 quality tiers

Excellent

42 (14.0%)

Very Good

41 (13.7%)

Good

47 (15.7%)

Average

170 (56.7%)

Find Your Diamond

Search 105 D I1 round diamonds and compare prices.

Search Diamonds

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