How much does a 0.20 to 0.49ct I SI1 natural asscher diamond cost?

As of October 2026, 0.20 to 0.49ct I SI1 natural asscher diamonds typically cost £285 GBP to £492 GBP, with a median price of £425 GBP. There are currently 6 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 24%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I SI1 Natural Asscher

Quick answer

As of October 2026, there are 6 natural asscher diamonds with I colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run £285 GBP to £492 GBP, with a median of £425 GBP. At least 27 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 24%. Half of all listings fall between £963 GBP and £1,221 GBP per carat. Over the last 30 days the median price moved +0.1% and the number of listings moved -14.8%.

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. Asscher natural stones in the index: 2,504 USD per carat, -3.3% 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

£220 GBP

Highest Price

£811 GBP

Average Price

£419 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

31.9%

Price Spread

24.1%

30-Day Price Trend

+0.1%

30-Day Supply Change

-14.8%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,422/ct

10th Percentile

$1,008

Median

$1,422

90th Percentile

$2,043

Score Distribution

24 diamonds scored across 4 quality tiers

Excellent

3 (12.5%)

Very Good

3 (12.5%)

Good

1 (4.2%)

Average

17 (70.8%)

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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