How much does a 0.20 to 0.49ct I I1 natural radiant diamond cost?

As of October 2026, 0.20 to 0.49ct I I1 natural radiant diamonds typically cost $428 SGD to $695 SGD, with a median price of $570 SGD. There are currently 3 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 radiant diamond?

About 2% of these diamonds are available at multiple retailers, with an average price spread of 13%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I I1 Natural Radiant

Quick answer

As of October 2026, there are 3 natural radiant diamonds with I colour and I1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $428 SGD to $695 SGD, with a median of $570 SGD. At least 5 retailers stock this exact specification, and 2% of the stones appear at more than one of them, with an average price spread of 13%. Half of all listings fall between $1,384 SGD and $1,577 SGD per carat. Over the last 30 days the median price moved +0.6% and the number of listings moved -4.7%.

Three of the best scored stones at this specification right now:

0.31ct Radiant I I1, IGI, grade A, from $175 SGD

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

$175 SGD

Highest Price

$741 SGD

Average Price

$550 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

1.7%

Price Spread

13.1%

30-Day Price Trend

+0.6%

30-Day Supply Change

-4.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,150/ct

10th Percentile

$1,018

Median

$1,150

90th Percentile

$1,298

Score Distribution

26 diamonds scored across 3 quality tiers

Excellent

1 (3.8%)

Good

2 (7.7%)

Average

23 (88.5%)

Find Your Diamond

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J I1J colour is visually identical to I to the naked eye

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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