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

As of October 2026, 0.75 to 0.99ct H SI1 natural radiant diamonds typically cost $1,652 AUD to $4,088 AUD, with a median price of $2,528 AUD. There are currently 66 diamonds matching this specification available across retailers.

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

About 26% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct H SI1 Natural Radiant

Quick answer

As of October 2026, there are 66 natural radiant diamonds with H colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,652 AUD to $4,088 AUD, with a median of $2,528 AUD. At least 55 retailers stock this exact specification, and 26% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between $2,258 AUD and $3,842 AUD per carat. The same specification in lab grown form lists at a median of about $1,015 AUD per carat. Over the last 30 days the median price moved +1.3% and the number of listings moved +9.3%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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

$772 AUD

Highest Price

$6,973 AUD

Average Price

$2,663 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

26.1%

Price Spread

55.4%

30-Day Price Trend

+1.3%

30-Day Supply Change

+9.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$2,009/ct

10th Percentile

$1,268

Median

$2,009

90th Percentile

$3,587

Score Distribution

204 diamonds scored across 4 quality tiers

Excellent

14 (6.9%)

Very Good

41 (20.1%)

Good

28 (13.7%)

Average

121 (59.3%)

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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 17%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 64%

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