Three Riding Themed Brooches

Riker Bros. enameled horseshoe brooch, seed pearls, stamped "14K" and with maker's mark, yellow gold, 1-1/2 x 1-3/8 in., 4.7 grams,ÿspots of wear to enamel, light tarnish and scratches; horseshoe with 27 old mine cut diamonds estimated total weight 0.90ct., G-J, VS to SI, stamped"18K, A10531", yellow gold, mounting tested platinum, 1-1/4 x 1-1/8 in., 6.2 grams, slightly misshapen, light wear and scratches; riding crop, stamped "Karat" and with maker's mark (possibly acorn?), tested 14kt. yellow gold, 1/2 x 2-1/2 in. 4.1 grams,ÿtarnish, wear and scratchesProvenance: Historic Bremo Plantation, Bremo, Virginia