Vintage Pieces of Turquoise and other stones

Description

From father in law's estate. He taught jewelry making in the 1960-1980s
Not sure what all of the pieces are. Know majority is turquoise
3 pieces of the turquoise have holes drilled in the center
largest slab of turquoise is approx 7/8" x 5/8" and maybe 3/16" high
I have tried to include any imperfections in the description or pictures.  Please ask any questions before bidding.