Glucinum

Glucinum: (Also called "Beryllium") A rare silver-white metallic element resembling magnesium.

Beryllium: Another name for Glucinum.
Betrothal Ring: A tradition dating back to as early as ancient Rome where it was called an anulus pronubus, ...

Danalite: A reddish mineral composed of iron, zinc manganese, glucinum and sulphur occurring in massive octahedral crystals. Danalite is named after James Dwight Dana.

It is highly improbable that the oxides of glucinum, aluminum, chromium, and silicon, which enter into the composition of the mineral emerald could have been transported in the gaseous form.

See also: Gold, Mineral, Precious, Crystal, Garnet