How much does a 1.00 to 1.49ct I SI1 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct I SI1 natural marquise diamonds typically cost $3,460 NZD to $9,977 NZD, with a median price of $5,598 NZD. There are currently 253 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI1 marquise diamond?

About 38% of these diamonds are available at multiple retailers, with an average price spread of 46%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI1 Natural Marquise

Quick answer

As of November 2026, there are 253 natural marquise diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $3,460 NZD to $9,977 NZD, with a median of $5,598 NZD. At least 62 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 46%. Half of all listings fall between $4,824 NZD and $7,553 NZD per carat. The same specification in lab grown form lists at a median of about $1,501 NZD per carat. Over the last 30 days the median price moved +0.2% and the number of listings moved +16.8%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Marquise natural stones in the index: 2,177 USD per carat, -4.2% 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: November 2026

Available

253

Lowest Price

$2,452 NZD

Highest Price

$21,699 NZD

Average Price

$6,461 NZD