Wonderful modernist pin by Israeli artist Bat Ami. This electroform or hollow cast design is called "spaghetti". It is sterling silver and set with carnelian, sodalite, and chrysoprase cabochons. This is part of a 3 piece set, please see the last picture. The other pieces are also available in my shop.
The condition is excellent. You will notice a small hole on the back of the brooch. This is a necessary part of the electroform casting process to prevent it from exploding. It is signed Bat Ami 925. It measures 3x2 inches.