Emu egg naturally blue/green on silver metal base (1920's)

Real naturalized emu egg (emptied) on silver metal bases (dated 1921-22 of the goldsmith edmond massabora. Templar house?). Unlike ostrich eggs, emus eggs are naturally black with a green/bluish tint. Perfect condition. Egg dimension with base: (height) approx. 22 cm X (width) 8 cm / 8.5 cm X (depth) 8 cm / 8.5 cm. Egg size: (height) approx. 13 cm X (width) 8 cm / 8.5 cm X (depth) 8 cm / 8.5 cm. Base dimension: (height) 9.3 cm X (width) 4cm X (depth) 4cm.