noble metal

A natural alloy of gold containing 20 per cent silver, termed electrum, is the lowest grade of the noble metal.

It is well said; but the last letter to Frank Scott is scarcely 210 of a noble metal.

There was a noble metal collar—about thirty-two, the size would have been, on the usual scale.

But now, at the first and yet final trial, she is proved and found to be of noble metal.

It is well said; but the last letter to Frank Scott is scarcely of a noble metal.