The metal that corresponds to Fridays is copper which is associated with the planet Venus and the element Water. Copper is a receptive and warm metal, thought to be lucky and encourages and draws love into your life.
Stones and crystals associated with Friday are:
Emerald- This is a receptive ston, corresponding to Venus and Earth, and metals associated with it are copper and silver. Emeralds are thought to improve memory and clairvoyant abilities, and when they are worn, they promote love and happiness.
Coral- Coral is associated with Aphrodite and Venus, the planet Venus and the element Water. Coral has been used for thousands of years and the ancient Romans believed that when children wore coral beads it protected them and healed wounds. Folklore says that coral earrings were once worn to attract men, so if you're looking for some romance, give it a shot.
Amber- A healing stone linked to the Goddess Freya, the Sun and Fire. It can be used for promoting beauty and strength, as well as fertility, love, prosperity, protection and personal power increasing magick.
Rose quartz- This is a pink quartz stone that corresponds with the sun and the Moon, as well as the elements Fire and Water. It's thought to be receptive, which helps in attracting things such as joy, harmony, love, comfort in a romantic relationship, and love for yourself. It also makes a nice friendship gift. One of my close friends got married over the summer and shortly before the wedding she began to have trouble sleeping and she and her fiancée were arguing a lot about minor things, so I gave her a rough rose quartz and a tumbled amethyst and things settled down a bit for her.