How much does a 1.00 to 1.49ct D SI1 natural round diamond cost?

As of October 2026, 1.00 to 1.49ct D SI1 natural round diamonds typically cost $3,907 AUD to $11,534 AUD, with a median price of $6,568 AUD. There are currently 2,221 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 52%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct D SI1 Natural Round

Quick answer

As of October 2026, there are 2,221 natural round diamonds with D colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $3,907 AUD to $11,534 AUD, with a median of $6,568 AUD. At least 73 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 52%. Half of all listings fall between $4,412 AUD and $7,222 AUD per carat. The same specification in lab grown form lists at a median of about $545 AUD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved +6.6%.

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

2,221

Lowest Price

$1,231 AUD

Highest Price

$23,609 AUD

Average Price

$7,252 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

36.6%

Price Spread

52.4%

30-Day Price Trend

-0.4%

30-Day Supply Change

+6.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$3,769/ct

10th Percentile

$2,609

Median

$3,769

90th Percentile

$6,433

Score Distribution

4.7K diamonds scored across 4 quality tiers

Excellent

643 (13.8%)

Very Good

1,037 (22.3%)

Good

1,142 (24.5%)

Average

1,831 (39.4%)

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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