Democratic Republic of the Congo Crafted in Russia, this is a virtuoso intarsia work box created with virtually invisible seams and book-matching panels of rare chatoyant malachite which was intergrown with chrysocolla. The effect is stunning with the liveliest of colors. The hinged lid opens to reveal a wood lined interior, with black dolerite borders, numbered 0721, signed Konstantin Libman. Measuring 7 1/2 x 5 3/4 x 2 in