These are so Tasmanian! The button grass is an iconic Tasmanian plant which grows in the remote southwest and west parts of the State. For many of us it is a symbol of 'wild places'.
The earrings come in three versions:
Black/silver: To make them black they have had a patina applied. The ear-wires are sterling silver.
Silver: solid sterling silver with silver ear-wires.
Bronze: solid bronze with sterling silver ear-wires. These ones are slightly lighter in weight due to the difference in the metals.
This is the black version. The silver and Brass ones are listed separately on the site.