Visually the green stones in the first resemble chrome diopside. The last two look like white stones, and that white solitaire looks like a scratched up cz.
A lot of stones can look alike if you don't know what to look for. For instance, if that first stone looks "flat" (without some refraction) it could be glass or synthetic tourmaline or chrome diopaide, among other gems. If it's "silky" and dull it could be peridot, but it looks a little to "granny smith" to be one IMO. If it's refractive or "glittery" it can indicate anything from natural green garnet to YAG to CZ.
Knowing if these are natural gemstones would narrow it down. I know my answer wasnt too helpful but it should give you something to work with. Best of luck!
A lot of stones can look alike if you don't know what to look for. For instance, if that first stone looks "flat" (without some refraction) it could be glass or synthetic tourmaline or chrome diopaide, among other gems. If it's "silky" and dull it could be peridot, but it looks a little to "granny smith" to be one IMO. If it's refractive or "glittery" it can indicate anything from natural green garnet to YAG to CZ.
Knowing if these are natural gemstones would narrow it down. I know my answer wasnt too helpful but it should give you something to work with. Best of luck!