My rainbow crystal

The rainbow and silver clashes together,
cuts through the air.
Whenever I am around my stone of colours,
it gives the greatest gift of all:
luck.
My gem is an eye from a golden tiger,
a beacon of life and death.
My rainbow stands out and has never failed.
A diamond from a sunken pirate ship.
His rays of light are blinding to any eye in its way.
Its glory grows every second.