Sarah Coventry Inca Fire Red Black Marbled Necklace Brooch Pin Medallions Necklace Vintage 1978. Plastic cabs of dark red swirled with black are the centers of these two square openwork pendants in antiqued silvertone. The large pin piece is 2 1/4 inches by 2 1/4 inches and is the pin that may also be attached to the bottom of the necklace medallion or by itself as just a pin. The smaller piece is 1 1/4 inches high and 1 inch wide with a hook at the top and bottom to go on the 22 inch chain. What a beautiful set in very good used condition sold just as found.