Brooch of gold with nine colored gems; Brooch of gold with nine colored gems. The sides of the brooch are cut open; so that the light behind the stones can come in; which provides extra sparkle. The stones are of eight different types; including tour line; aquamarine; green beryl; pink corundum; yellow topaz; red topaz; chrysoberyl; citrine and pink corundum. The maker's mark is somewhat defeated.; Fa. Kellenbach & Co; Rotterdam; c. 1925; gold (metal); tourmaline; aquamarine (mineral); beryl; corundum; topaz (mineral); citrine; filigree; h 0.7 cm x w 5.5 cm w 5.9 gr