Emerald

The “San Jose”, which was sunk by the British fleet on June 7, 1708, contains, according to experts, at least 200 tons of gold, silver & emeralds

A pair of rare diamond and emerald spectacles from an unknown Indian princely treasury will be sold at an auction in London later this month.

The lenses were placed in the Mughal-era frames around 1890, according to auction house Sotheby's.

The spectacles will be offered at auction for $2 million - $3.4 million each, the auction house said.