Two amethyst and diamond pendants

Two amethyst and diamond pendants, including a George III brooch pendant, set with an oval-shaped amethyst within a surround of old cushion-shaped diamonds in silver and gold closed-back setting, 2.5cm wide, together with an early 20th century pendant, set with an oval-shaped amethyst below rose-cut diamonds and a seed pearl in platinum and gold, later gold bale, 4cm high (including bale)