How much does a 0.20 to 0.49ct I VS1 natural marquise diamond cost?

As of October 2026, 0.20 to 0.49ct I VS1 natural marquise diamonds typically cost $398 AUD to $1,049 AUD, with a median price of $650 AUD. There are currently 225 diamonds matching this specification available across retailers.

Where can I find the best price on a I VS1 marquise diamond?

About 44% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I VS1 Natural Marquise

Quick answer

As of October 2026, there are 225 natural marquise diamonds with I colour and VS1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $398 AUD to $1,049 AUD, with a median of $650 AUD. At least 16 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $1,506 AUD and $2,356 AUD per carat. The same specification in lab grown form lists at a median of about $963 AUD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +4.8%.

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: October 2026

Available

225

Lowest Price

$242 AUD

Highest Price

$2,300 AUD

Average Price

$698 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

43.8%

Price Spread

41.0%

30-Day Price Trend

-0.4%

30-Day Supply Change

+4.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,457/ct

10th Percentile

$846

Median

$1,457

90th Percentile

$1,785

Score Distribution

459 diamonds scored across 4 quality tiers

Excellent

103 (22.4%)

Very Good

133 (29.0%)

Good

71 (15.5%)

Average

152 (33.1%)

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Consider Instead

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

I VS2VS2 inclusions are not visible without magnification

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Lab-Grown I VS1Same specifications, lab-grown origin

Save 54%

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