There is a Hallmark that is barely visible Made in USA and a symbol which I cannot photograph which appears to be a star with circle made of dots.
Reference: Warman's Vintage Jewelry Identification and price guide, By Leigh Leshner, , Krause Publications 2008 p. 117, p.11
Reference: American Costume Jewelry- Art & Industry, Brunialti & Brunialti, Schiffer, 2008, p. 169
Dimensions: 1 3/4" x 1 1/2"
Reference: Unsigned Beauties of Costume Jewelry, Identification & Values, Marcia "Sparkles" Brown, Collector Books 2002, page 81
Dating from the late Gerogian early Victorian eras, this agate was mined, polished up and beveled to show off its opaque colors and translucency.
The reverse features a fine working t-hinge and longer, earlier Victorian pinbar with c-clasp. CONDITION: Excellent DIMENSIONS: 3 3/8" X 2 1/2" DATES: 1830-1850
Dimensions: Inside 2 1/2" x 2 3/16"
In "American Costume jewelry by Brunialti & Brunialti, v. 2 p.164. she is called "Female Head" from 1941. Vogu;e, October 1. 1941 called her "platinum head" .
Blood stone is Plasma with red sports of iron oxide. Plasma is dark green, opaque chalcedonly quartz with the color coming from the chlorite.