Were diamonds ever mounted in a copper setting?

The term 'were' purports to look back into the history of diamonds as adornment, which history reaches back about 6,000 years.

Copper is a relatively soft metal and would not be secure for a diamond -- for long. There may have been diamonds that were set in copper.

Today, a buyer can commission that a diamond be set in rose gold, which is gold mixed with copper, to give the setting somewhat the copper colour, while securing the gem in a stronger metal.