Ancient jewelry is up for auction at Christie's on Feb. 4, where buyers can snag a piece of history for less than today's modern fine jewelry. Tamara Beckwith/NY Post Who needs jewelry fit for a ...
More than 5,000 years ago, in ancient Egypt, a mixture of silica, lime, copper, and an alkali was heated, resulting in a bright blue compound known as calcium copper silicate. This striking, vibrant ...