Rose gold, which is sometimes called “pink gold,” may seem more exotic than run-of-the-mill yellow, but the secret to its color is comparatively pedestrian: copper.

Northlight 4.5" Rose Gold Geometric Wire Star Christmas Ornament You'll hang this Northlight 4.5" Rose Gold Geometric Wire Star Christmas Ornament ($8, originally $10) on your tree for years to come.

For most of the general public, the first we'd ever heard of the colour was when Apple launched the rose gold iPhone 6S line in September 2015.

The announcement, last week, that, with its new generation of iPhones, Apple would be offering a model that was “rose gold” in color made the news that it was meant to: “The internet has ...