17. An educational device as claimed in claim 15 wherein: said first set of external indicia of said medallions of said rings on said fingers comprise first stones which stone colors match the colors of the color-coded keys to be struck by said fingers of the left hand; said second set of external indicia of said medallions of said rings on said fingers comprise second stones which stone colors match the colors of the color-coded keys to be struck by said fingers of the right hand.
18. An educational device as claimed in claim 17 wherein: said first stones are cut into first geometrical patterns, said first geometrical patterns having first shapes which first shape names begin with a letter corresponding to the key of the keyboard to be struck by said finger of the left hand; said second stones are cut into second geometrical patterns, said second geometrical patterns having second shapes which second shape names begin with a letter corresponding to the key of the keyboard to be struck by said finger of the right hand.