They have consistently been the most famous piece of jewellery. We know that rings are “the article of jewellery around which centres tradition, antiquity, utility and symbolic meaning of the greatest reverential character.”
An atmosphere of magic and charm has always surrounded them. There has been a strong belief that both good and evil spirits inhabited rings.
You wear engagement rings on the left-hand ring finger, which had a vein that ran directly to the heart, later named Vena amoris.
How to take care of your pearls is very good explained here.