Twenty years on and 2,603% up from its start date; Blackrock ML Gold and General Fund has every reason to celebrate. Nor is there any sight of an end to good times for gold and hopefully the fund yet. According to the London fund manager, Graham Birch, the fundamentals are just “too compelling”.

Prices give the rankings. Diamonds generally come top. Ruby and emerald are also priced higher than a top quality sapphire, due to their rarity. For a one-carat ruby stone the bill is likely to be between $250 and $10,000 per carat. Truly quality gems will cost more.