(details from "La Primavera") (see related A), 1480 Alessandro Filipepi (known as Botticelli) (1445 - 1510) Uffizi Gallery, Florence, Tuscany, Italy
The name Zephyr or Zephurus stands for a gentle fertilizing wind from the west seen as a prodrome (forecast, prognosis) of Spring or Primavera (more in related images).
He is portrayed here in blue - a pointer to the usually deep blue gemstones called Sapphire. Among the hardest natural stones, the color of Sapphires which represent a mineral corundum is due to trace elements - if aluminium, the gemstone is blue - traces of iron, titanium, chromium, etc. produce other colors - if red, sapphires are called Rubies.