How much does a 1.50 to 1.99ct L SI1 natural heart diamond cost?

As of November 6, 2026, 1.50 to 1.99ct L SI1 natural heart diamonds typically cost $2,650 AUD to $7,979 AUD, with a median price of $4,170 AUD. There are currently 43 diamonds matching this specification available across retailers.

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

About 51% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct L SI1 Natural Heart

Quick answer

As of November 6, 2026, there are 43 natural heart diamonds with L colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $2,650 AUD to $7,979 AUD, with a median of $4,170 AUD. Half of all listings fall between $1,879 AUD and $3,286 AUD per carat. Over the last 30 days the median price moved +1.1% and the number of listings moved +45.8%.

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. Heart natural stones in the index: 2,289 USD per carat, -3.7% 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

Lowest Price

$2,472 AUD

Highest Price

$10,881 AUD

Average Price

$4,555 AUD

Market Intelligence

Cross Retailer %

51.2%

Price Spread

50.8%

30-Day Price Trend

+1.1%

30-Day Supply Change

+45.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,904/ct

10th Percentile

$1,206

Median

$1,904

90th Percentile

$3,652

Score Distribution

43 diamonds scored across 4 quality tiers

Excellent

8 (18.6%)

Very Good

14 (32.6%)

Good

5 (11.6%)

Average

16 (37.2%)

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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