Shattered by Brimstone. Brimstone once admired Amber, but amber simple saw her as a weapon she could use.

Pre Invasion:
Homeworld invasion recruit. Loyal to Yellow Diamond

During Invasion:
Fought  to take Earth. Adopted Shirley, a deemed broken gem. She used her amber  ability to seal the crack in Shirley's gem. Due to her research of  earth, she thought it would be funny to name her Shirley due to her  being a Cherry Opal, but now with some amber.
At some point, she shatters.
She was a part of Dushan's army.
She  treated Brimstone, an semi-corrupt gem, as an equal, a part of their  cause. This had shocked Brim. Amber simply does not care what you are,  as long as you are on her side.

After Invasion:
A bunch of fragments, wrapped in a hard amber pendant case Shirley made for her shards.