Color shades on Mexico 1856 2R stamps from plate I

Emeralds

Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald
Emerald

Olives

Olive
Olive
Olive
Olive
Olive
Olive
Olive
Olive
Olive

Sapphires

Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire
Sapphire