cobalt vs turquoise

cobalt

• Cobalt blue. 

• A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal. 

turquoise

• A pale greenish-blue colour, like that of the gemstone. 

• A sky-blue, greenish-blue, or greenish-gray semi-precious gemstone. 

• turquoise 

• Having a pale greenish-blue colour. 

• Made of turquoise (the gemstone).