Hi Kevin,
Condolences on your Grandmother's passing. We can try to help you with dating and identifying the maker on your pieces but we do not give values.
It would help if you could show the front and backs of each piece near one another and any marks. Frequently the construction of the back or the way it is finished is very helpful in determining the maker or when it was made. A lot of costume jewelry was not made by the company that "signed" it but purchased from jobbers. That said, most of the pieces you have shown are from the 1950's - 1960s; and some of the earrings and one of the necklaces could be from the late 1940s.
The first necklace, marked Florenza is late 1950's - early 1960's. The second one "might" be Schreiner but could you show us the front, please? The rhinestone necklace is Lisner; again 1950s; the one with the pearl drop is from about the same period - possibly late ; 40's - early '50s. The red rhinestone earrings and the last pair look like D&E (DeLizza & Elster) C. 1960's ; I think the drop with the pearls is either Florenza or Art, but again if you can show the fronts and the backs and any marks it will really help.
edited: Cross-posted with Laura!