Rose gold

Let's not confuse the rose gold

On her ring finger

With the gold described as red

In established greco-roman texts

No ancient impurity

Colours her earrings

The taints a good smelter

Considers then derides and rejects

Her gold is gold-copper alloy

Not too gold or red

Perfectly pink, russian gold

All the rage two centuries ago

Her smile has infinite worth

Thanks to the rose gold

Formed by mixing base metals

Heated and melted until they glow

[I read this at SciPo 2018: A meeting of Science and Poetry (https://www.st-hildas.ox.ac.uk/content/scipo-2018-meeting-science-and-poetry)]