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

As of October 2026, 0.20 to 0.49ct D SI1 natural round diamonds typically cost $495 AUD to $1,437 AUD, with a median price of $817 AUD. There are currently 13,167 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 58%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct D SI1 Natural Round

Quick answer

As of October 2026, there are 13,167 natural round diamonds with D colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $495 AUD to $1,437 AUD, with a median of $817 AUD. At least 38 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 58%. Half of all listings fall between $1,744 AUD and $3,010 AUD per carat. The same specification in lab grown form lists at a median of about $847 AUD per carat. Over the last 30 days the median price moved -7.3% and the number of listings moved +13.3%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

13,167

Lowest Price

$175 AUD

Highest Price

$3,446 AUD

Average Price

$909 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

37.4%

Price Spread

57.8%

30-Day Price Trend

-7.3%

30-Day Supply Change

+13.3%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,541/ct

10th Percentile

$1,077

Median

$1,541

90th Percentile

$3,246

Score Distribution

20.1K diamonds scored across 4 quality tiers

Excellent

5,609 (27.9%)

Very Good

6,101 (30.3%)

Good

5,325 (26.5%)

Average

3,073 (15.3%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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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