@Saarebas Well, there's a few things I have in mind. One is something to do with fire, perhaps, since amber is associated with fire. Mild form of pyrokinises, maybe? Ability to generate heat?
Another idea is the ability to make liquids turn solid, since amber starts off as resin and hardens over many years.
This one probably won't be very useful, but Amber could be
Jesus able to walk on water, since it can float in salt water (but not fresh water).
The last idea is to petrify others for short periods of time, since amber is known to imprison and seal off insects and other small critters.