dark blue vs sapphire

dark blue

• A deep, dim blue colour: navy or similar. 

• A member of the Oxford rowing team. 

sapphire

• 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. 

• of a deep blue colour. 

• pertaining to a 45th year