How much does a 0.20 to 0.49ct D SI1 natural radiant diamond cost?

As of October 2026, 0.20 to 0.49ct D SI1 natural radiant diamonds typically cost $698 NZD to $1,581 NZD, with a median price of $1,041 NZD. There are currently 70 diamonds matching this specification available across retailers.

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

About 25% of these diamonds are available at multiple retailers, with an average price spread of 81%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct D SI1 Natural Radiant

Quick answer

As of October 2026, there are 70 natural radiant diamonds with D colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $698 NZD to $1,581 NZD, with a median of $1,041 NZD. At least 12 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 81%. Half of all listings fall between $2,115 NZD and $4,203 NZD per carat. The same specification in lab grown form lists at a median of about $1,269 NZD per carat.

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

Lowest Price

$369 NZD

Highest Price

$3,202 NZD

Average Price

$1,105 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

25.0%

Price Spread

81.2%

Price Range

Price per carat distribution across retailers

$1,445/ct

10th Percentile

$964

Median

$1,445

90th Percentile

$4,516

Score Distribution

160 diamonds scored across 4 quality tiers

Excellent

15 (9.4%)

Very Good

17 (10.6%)

Good

63 (39.4%)

Average

65 (40.6%)

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Consider Instead

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

Lab-Grown D SI1Same specifications, lab-grown origin

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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