Brand New Handmade Carved Flower Green Aventurine Ring. Size 8 Green Aventurine is known as "the Stone of Opportunity", thought to be the luckiest of all crystals. This stone is often used for manifesting prosperity and wealth, and for increasing favor in competitions or games of chance. Its winning energy makes it a great ally for boosting one's chances in any situation! New to Poshmark? Use referral code KIMBERLYN222 to receive $10.