cerulean vs sapphire

A greenish-blue color. 

Any of various lycaenid butterflies of the genus Jamides. 

A deep blue colour. 

Any of the butterflies in the southern Asian lycaenid genus Heliophorus. 

Any hummingbird in the genera Hylocharis and Chlorestes, as well as the rufous-throated sapphire, which is now in the genus Amazilia. 

A clear deep blue variety of corundum, valued as a precious stone. 

A white, yellow, or purple variety of corundum, either clear or translucent.