Welcome Trisi!
Just some general guidelines for posting photos. Big stuff, cellphone no problem but with a size reference. Jewelry and other small items where great detail is necessary to ID hallmarks and stones should be photoed outside on a overcast day shielded from direct sunrays by a shield made from an opaque milk jug. The devil is in the details, tripod mounted time delay photos on aperture priority settings will produce the best photos.
I can tell you from the photos I can see, when the stones are set into solid backed cups often the stones are foil backed aka Rhinestones. Cut glass with shiny reflectors glued on the backs.
The reflected hues are most likely the result of tinted reflectors.
In order to accurately evaluate jewelry, costume from high quality, we need accurate photos with hallmarks or any provenance available from owners or family members.
If you know a pawn broker who will evaluate your finds without a fee, use him first. If you have an item with documented or specific info show it to us and we'll try our best.
Best wishes!