Most valuable advent calendar

According to Official Guinness Records,

The most valuable advent calendar was valued at €2.5 million (then approx. £2,100,00;$3,300,000) and was crafted by Octagon Blue GVC (Belgium) and valued on 30 November 2010.
The calendar was made up of 24 glass tubes each containing a small package of a diamond wrapped in silver. The glass tubes each featured an angel. the calendar contains 124 diamonds.

For a complete list of 2010 records, please visit 2010 Guinness Records in Belgium.

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