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

As of October 2026, 0.75 to 0.99ct D SI1 natural radiant diamonds typically cost $1,812 AUD to $4,963 AUD, with a median price of $3,238 AUD. There are currently 69 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Natural Radiant

Quick answer

As of October 2026, there are 69 natural radiant diamonds with D colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,812 AUD to $4,963 AUD, with a median of $3,238 AUD. At least 57 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $2,700 AUD and $4,710 AUD per carat. The same specification in lab grown form lists at a median of about $615 AUD per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +12.5%.

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. 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

$853 AUD

Highest Price

$8,819 AUD

Average Price

$3,318 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

28.9%

Price Spread

56.8%

30-Day Price Trend

-1.2%

30-Day Supply Change

+12.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,488/ct

10th Percentile

$1,535

Median

$2,488

90th Percentile

$4,617

Score Distribution

247 diamonds scored across 4 quality tiers

Excellent

30 (12.1%)

Very Good

41 (16.6%)

Good

47 (19.0%)

Average

129 (52.2%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same specifications, lab-grown origin

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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