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The company sponsored a worldwide index from Art Market Research with the specific intention of tracking the performance of a High Net Worth policyholder’s collection, using information collated by Zurich Private Clients. The results, which are used to advise policyholders of changes within the art market, showed a typical High Net Worth collection had increased in value by 785 per cent over the past 25 years.

The price information for the Index, put together from thousands of salerooms across the world as well as other sources, rated the five highest increases in value over the past 18 months among the following categories:

• European 18th century porcelain (17 per cent)
• English 18th century furniture (11 per cent)
• English Regency furniture (10 per cent)
• European 19th and 20th century sculpture (eight per cent)
• Contemporary Masters (six per cent)

The only categories to register a dramatic fall during the same period were British Victorian paintings (down 12 per cent) and clocks and watches (down six per cent).