How much does a 0.20 to 0.49ct H SI1 natural cushion diamond cost?

As of October 2026, 0.20 to 0.49ct H SI1 natural cushion diamonds typically cost $372 AUD to $972 AUD, with a median price of $580 AUD. There are currently 41 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 52%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct H SI1 Natural Cushion

Quick answer

As of October 2026, there are 41 natural cushion diamonds with H colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $372 AUD to $972 AUD, with a median of $580 AUD. At least 10 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 52%. Half of all listings fall between $1,359 AUD and $2,279 AUD per carat. Over the last 30 days the median price moved +2.1% and the number of listings moved +5.0%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

Lowest Price

$224 AUD

Highest Price

$2,050 AUD

Average Price

$648 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

32.1%

Price Spread

52.4%

30-Day Price Trend

+2.1%

30-Day Supply Change

+5.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,232/ct

10th Percentile

$810

Median

$1,232

90th Percentile

$2,079

Score Distribution

108 diamonds scored across 4 quality tiers

Excellent

16 (14.8%)

Very Good

9 (8.3%)

Good

37 (34.3%)

Average

46 (42.6%)

Find Your Diamond

Search 41 H SI1 cushion diamonds and compare prices.

Search Diamonds

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