“Envy: To feel displeasure and ill-will at the superiority of another in happiness, success, and the possession of anything desirable”
Jealousy: An apprehension of losing something or someone to another, of losing a loved one to a rival. Typically a third person, a rival, enters the scene and attempts to take away a lover.”
A person would envy another because the standard is unlikely to be achieved by him. For example, the next door Joe is envious of Jack Ma, Bill Gates, Warren Buffet…etc. He would not be jealous of these super high net worth people because he is no where near to their monetary status.
A person would be jealous of another because he is very close to achieving the rival’s standard or at the very least perceived to be attainable by him. For example, Joe is jealous of John’s recent promotion to managerial position. Joe has been working very hard for that position and was very disappointed that he was not given the promotion. It is unlikely that Joe is envious of John in this regard.