How much does a 0.75 to 0.99ct H SI1 natural round diamond cost?

As of October 2026, 0.75 to 0.99ct H SI1 natural round diamonds typically cost $1,755 AUD to $4,981 AUD, with a median price of $2,781 AUD. There are currently 2,527 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 round diamond?

About 35% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct H SI1 Natural Round

Quick answer

As of October 2026, there are 2,527 natural round diamonds with H colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,755 AUD to $4,981 AUD, with a median of $2,781 AUD. At least 66 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between $2,409 AUD and $3,986 AUD per carat. The same specification in lab grown form lists at a median of about $1,949 AUD per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +7.5%.

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 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

2,527

Lowest Price

$856 AUD

Highest Price

$8,305 AUD

Average Price

$3,131 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

34.9%

Price Spread

52.5%

30-Day Price Trend

-1.6%

30-Day Supply Change

+7.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,112/ct

10th Percentile

$1,405

Median

$2,112

90th Percentile

$3,790

Score Distribution

4.8K diamonds scored across 4 quality tiers

Excellent

689 (14.3%)

Very Good

1,224 (25.4%)

Good

1,363 (28.2%)

Average

1,549 (32.1%)

Find Your Diamond

Search 2,527 H SI1 round diamonds and compare prices.

Search Diamonds

Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

Save 19%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 35%

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