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

As of October 2026, 1.50 to 1.99ct I IF natural round diamonds typically cost $8,709 AUD to $30,793 AUD, with a median price of $13,323 AUD. There are currently 253 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I IF Natural Round

Quick answer

As of October 2026, there are 253 natural round diamonds with I colour and IF clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $8,709 AUD to $30,793 AUD, with a median of $13,323 AUD. At least 60 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between $7,334 AUD and $11,549 AUD per carat. The same specification in lab grown form lists at a median of about $659 AUD per carat. Over the last 30 days the median price moved -3.0% and the number of listings moved +12.9%.

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. 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

253

Lowest Price

$5,247 AUD

Highest Price

$44,982 AUD

Average Price

$16,774 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

36.4%

Price Spread

46.9%

30-Day Price Trend

-3.0%

30-Day Supply Change

+12.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$6,320/ct

10th Percentile

$4,409

Median

$6,320

90th Percentile

$10,464

Score Distribution

786 diamonds scored across 4 quality tiers

Excellent

225 (28.6%)

Very Good

180 (22.9%)

Good

131 (16.7%)

Average

250 (31.8%)

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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

Save 28%

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