When a demolition crew in 1912 discovered a cache of some 500 jewelry pieces and gems buried in a Cheapside cellar in London, they had no idea they had uncovered one of the greatest jewelry finds of the 20th century. This extraordinary and priceless cache of late-16th- and early-17th-century jewelry and gemstones is on display as a collection for the first time at the Museum of London through April 2014. The Cheapside Hoard: London’s Lost Jewels, sponsored by Fabergé and the mining company Gemfields, is consid…