How much does a 1.50 to 1.99ct I IF natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct I IF natural radiant diamonds typically cost $6,810 AUD to $14,512 AUD, with a median price of $10,860 AUD. There are currently 11 diamonds matching this specification available across retailers.

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

About 43% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I IF Natural Radiant

Quick answer

As of October 2026, there are 11 natural radiant diamonds with I colour and IF clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,810 AUD to $14,512 AUD, with a median of $10,860 AUD. At least 40 retailers stock this exact specification, and 43% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between $5,330 AUD and $9,267 AUD per carat. The same specification in lab grown form lists at a median of about $572 AUD per carat. Over the last 30 days the median price moved +1.3% and the number of listings moved +54.9%.

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

$4,816 AUD

Highest Price

$23,632 AUD

Average Price

$10,541 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

43.1%

Price Spread

55.8%

30-Day Price Trend

+1.3%

30-Day Supply Change

+54.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,965/ct

10th Percentile

$2,915

Median

$4,965

90th Percentile

$8,466

Score Distribution

26 diamonds scored across 4 quality tiers

Excellent

9 (34.6%)

Very Good

7 (26.9%)

Good

6 (23.1%)

Average

4 (15.4%)

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Consider Instead

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

J IFJ colour is visually identical to I to the naked eye

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Lab-Grown I IFSame 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