The egg of G. bispecularis is more obtuse and broader, there is a brighter gloss on it, and the Speckling is more marked; but with a large series of each I think the only perceptible difference would be its greater breadth, which makes the egg look larger than that of the Black-throated Jay.
"The Nests and Eggs of Indian Birds, Volume 1"
Allan O. Hume
Of course in different specimens the density of the Speckling varies greatly: in some eggs not a fifth of the surface is covered with the markings, while in some it appears as if there were more of these than of the ground-colour.
"The Nests and Eggs of Indian Birds, Volume 1"
Allan O. Hume
They have a dead-white ground, thickly speckled and spotted with blackish and purplish brown, and have but a slight gloss; the Speckling, everywhere thick, is generally densest at the large end, and there chiefly do spots, as big as an ordinary pin's head, occur.
"The Nests and Eggs of Indian Birds, Volume 1"
Allan O. Hume