USA, c. 1950 sterling silver, faceted quartz, onyx 3 h × 2.5 w × 0.5 d in (8 × 6 × 1 cm)
Quartz was faceted by lapidary Francis Sperisen, San Francisco.
Impressed artist's ciper to clasp on brooch.
Literature:Space, Light, Structure: The Jewelry of Margaret De Patta, Ilsa-Neuman and Muniz, pg. 93 illustrates related brooch
Earrings measure: 0.75 h x 0.5 w x 0.5 d inches and feature screwback construction. Minor patina to silver surfaces. Overall excellent condition. Total weight of earrings: 13.69 grams and brooch: 31.79 grams.