Art Deco onyx and diamond two row crossover cluster ring

Weight: 10g
Each row with flaring diamond set arm supporting a principal shield shaped stone, one a diamond, one an onyx, the diamond shield upon a bevelled edged 'tail' of graduated baguette onyx flanked by end-to-end baguette diamonds, the onyx shield to a tail of baguette diamonds flanked by end-to-end onyx, double shank.
Width of head across shields 1.7cm / 5/8''