The Vegvisir, also known as the runic compass or the Viking compass/Nordic compass made of eight Viking rune staves, is a symbol of protection and guidance believed to be used as a compass by Vikings. ... In the Galdrabok, it is written that this symbol would help its wearer to not get lost and find their way back.
Vegvísir's intent is described as follows: “If thi sign is carried, one will never lose one's way in storms or bad weather, even when the way is not known” And so, the symbol was drawn onto the forehead to ensure that the person didn't get lost when leaving home.
Green Aventurine is thought to be the luckiest of all crystals, especially in manifesting prosperity and wealth, or for increasing favour in competitions or games of chance.