How much does a 0.20 to 0.49ct I IF natural marquise diamond cost?

As of November 2026, 0.20 to 0.49ct I IF natural marquise diamonds typically cost $435 AUD to $1,040 AUD, with a median price of $674 AUD. There are currently 57 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 39%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I IF Natural Marquise

Quick answer

As of November 2026, there are 57 natural marquise diamonds with I colour and IF clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $435 AUD to $1,040 AUD, with a median of $674 AUD. At least 41 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 39%. Half of all listings fall between $1,820 AUD and $2,666 AUD per carat. Over the last 30 days the median price moved +1.2% and the number of listings moved +21.4%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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: November 2026

Available

Lowest Price

$354 AUD

Highest Price

$2,191 AUD

Average Price

$705 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

33.4%

Price Spread

39.0%

30-Day Price Trend

+1.2%

30-Day Supply Change

+21.4%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,525/ct

10th Percentile

$1,109

Median

$1,525

90th Percentile

$2,328

Score Distribution

142 diamonds scored across 4 quality tiers

Excellent

42 (29.6%)

Very Good

35 (24.6%)

Good

38 (26.8%)

Average

27 (19.0%)

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

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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