It is plastic/acrylic and is iridescent. I would say it is a pale orange colour.
Pair (2) Vintage Orange "Butterfly" SIM Cards - Factory Sealed 2000s Movie Prop
Handmade Phone Charm – Light Green Butterfly & Bow White Glass Beads
LIGHT ORANGE / DARK YELLOW Armband Case Jogging Running Apple iPhone 5 5S Holder
Magnetic Adapter Ring, 3Pcs ABS Magnetic Sticker Ring, Light Orange
Twelve South Butterfly SE 2-in-1 Qi2 USB-C Charging Station Iridescent - Refurb
Iridescent Butterfly Bag or Mobile Phone Charm - Ideal Present
