Antique Ring Multi Color Sparkly Stones Domed Prong Settings Adjustable

Big & beautiful & unusual.
One ornate antique ring with multi color rhinestones. 
Center stone is yellow, it's surrounded by 2 rows of smaller rhinestones in colors of pink, light blue, yellow, light green and lavender. There are 20 stones in this ring, each individually prong set. 
My guess is that they are rhinestones.

As it is the size is 4 3/4 (perfect 'pinky' ring). It is adjustable and has been adjusted based on the shape of the band which is not perfectly round. (please see all the pics). The base metal of the setting is gold color, the band is silver.
All pieces are secure, no loose stones.
Originally purchased from an antique store just about 50 years ago.

Thank you, let me know if you have any questions.