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

As of November 6, 2026, 1.00 to 1.49ct K SI1 natural marquise diamonds typically cost $2,283 NZD to $6,273 NZD, with a median price of $3,651 NZD. There are currently 248 diamonds matching this specification available across retailers.

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

About 39% 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 K SI1 Natural Marquise

Quick answer

As of November 6, 2026, there are 248 natural marquise diamonds with K colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,283 NZD to $6,273 NZD, with a median of $3,651 NZD. Half of all listings fall between $2,793 NZD and $4,386 NZD per carat. Over the last 30 days the median price moved +0.7% and the number of listings moved +14.7%.

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 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

248

Lowest Price

$1,564 NZD

Highest Price

$13,892 NZD

Average Price

$4,051 NZD

Market Intelligence

Cross Retailer %

38.7%

Price Spread

45.6%

30-Day Price Trend

+0.7%

30-Day Supply Change

+14.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,964/ct

10th Percentile

$1,209

Median

$1,964

90th Percentile

$2,991

Score Distribution

248 diamonds scored across 4 quality tiers

Excellent

44 (17.7%)

Very Good

80 (32.3%)

Good

64 (25.8%)

Average

60 (24.2%)

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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