Sorry about the delay, can you post a picture?
It could be anything. From a clear focused picture we will be able to see workmanship, air bubbles, some flaws. For instance, most gemstones are hard. There will be no divots or scratches on a real gem. Most gems in jewelry will be set in a precious metal like gold, silver, platinum...No gems will have air bubbles almost as a rule air bubbles equal glass. Lavender colored stones are common. I will edit with a short list.
Amethyst, chalcedony, flourite, spinel, sapphire and tourmaline.