Native American and Southwestern Jewelry

lot of 3, includes:

one set with nine cabochons; etched with an encircled B
width 1-3/4 inches, interior circumference 5-5/8 inches + gap length 1-1/4 inches, weight 38.4 dwt.

another set with a single cabochon accented with stamped silver panels; not marked
width 1-3/16 inches, interior circumference 5-1/2 inches + gap length 7/8 inch, weight 18.8 dwt.

the last, set with a single cabochon; not marked
width 7/8 inch, interior circumference 5-3/8 inches + gap length 1-1/4 inches, weight 18.7 dwt.