Riddonkulous

Iridescent splendor, Australia's treasured darling, At the height of your popularity, you were thought of so dear; Royals wanted you Common folk idolized your status Thieves carried you as a charm. And then you tumbled from your plinth, Becoming associated with bad luck, death, and the evil eye. As a few last clues, look to those born in October for something beloved mined Gild these old bones, and honor the dead And reflect on times that have long since fled. Now I remain ever hopeful, that you see now the answer is clearly...?