You have a beautiful hand embossed copper fireplace screen with wrought iron stand. NICE and even nicer that it was passed to you from your grandmother.
These were very stylish yet functional pieces of furniture that were used to prevent excessive heat from directly hitting occupants in a room - sort of a diffuser. This style is most commonly seen from the late 1800's to early 1900's when the "decorative" aspect was important as well as the function.
The values range all over the place depending on where you live. In my area (Texas) this would easily sell for $200+ if in fact it is a real copper piece and not painted. Even if it was painted....it would still bring $50+.