platinum

The chemical element with atomic number 78 and symbol Pt; a dense, malleable, ductile, highly unreactive, silverish-white transition metal of great value.

A whitish grey colour, like that of the metal.

A single or album that has achieved platinum sales, i.e. over 1 million or 2 million.

A platinum-based drug: a platin.

Of a whitish grey colour, like that of the metal.

Of a musical recording that has sold over one million copies (for singles), or two million (for albums).

Very expensive, or of very high quality

We can offer the platinum service for fifty dollars extra.

To attain all of the achievements in a game (originally on certain PlayStation consoles, now colloquially used regardless of platform).

I platinumed in Clash of Clans yesterday.