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

As of October 2026, 1.50 to 1.99ct I IF natural cushion diamonds typically cost $5,451 AUD to $13,132 AUD, with a median price of $7,724 AUD. There are currently 36 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I IF Natural Cushion

Quick answer

As of October 2026, there are 36 natural cushion diamonds with I colour and IF clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $5,451 AUD to $13,132 AUD, with a median of $7,724 AUD. At least 48 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between $4,708 AUD and $7,682 AUD per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +11.1%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

$4,515 AUD

Highest Price

$26,031 AUD

Average Price

$8,517 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

34.0%

Price Spread

49.8%

30-Day Price Trend

+0.4%

30-Day Supply Change

+11.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,199/ct

10th Percentile

$2,765

Median

$4,199

90th Percentile

$6,861

Score Distribution

95 diamonds scored across 5 quality tiers

Exceptional

1 (1.1%)

Excellent

24 (25.3%)

Very Good

22 (23.2%)

Good

34 (35.8%)

Average

14 (14.7%)

Find Your Diamond

Search 36 I IF cushion diamonds and compare prices.

Search Diamonds

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 36%

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