How much does a 1.50 to 1.99ct H SI2 natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct H SI2 natural radiant diamonds typically cost $4,989 AUD to $13,899 AUD, with a median price of $8,569 AUD. There are currently 150 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI2 radiant diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI2 Natural Radiant

Quick answer

As of October 2026, there are 150 natural radiant diamonds with H colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,989 AUD to $13,899 AUD, with a median of $8,569 AUD. At least 54 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 48%. Half of all listings fall between $4,148 AUD and $6,744 AUD per carat. The same specification in lab grown form lists at a median of about $1,326 AUD per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved +16.4%.

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. Radiant natural stones in the index: 3,091 USD per carat, +13.2% 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: October 2026

Available

150

Lowest Price

$2,994 AUD

Highest Price

$23,801 AUD

Average Price

$9,112 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

33.2%

Price Spread

48.0%

30-Day Price Trend

-0.8%

30-Day Supply Change

+16.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,802/ct

10th Percentile

$2,322

Median

$3,802

90th Percentile

$5,814

Score Distribution

444 diamonds scored across 4 quality tiers

Excellent

85 (19.1%)

Very Good

97 (21.8%)

Good

90 (20.3%)

Average

172 (38.7%)

Find Your Diamond

Search 150 H SI2 radiant diamonds and compare prices.

Search Diamonds

Consider Instead

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

Lab-Grown H SI2Same specifications, lab-grown origin

Save 75%

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