...The light reflected off its pale green surface, glinting off what seemed to be veins coursing through the stone. A curious ring, just lying there as if asking to be found…
...The ring slid onto her finger as if it were lovingly crafted just for her. Its diamond seemed to take in the sunlight, amplify and reflect it in every direction. Then almost immediately, the light waned and the stone went dark. Her throat clutched in a constricting gurgle before she slumped to the ground, still and lifeless.
Mages/ wizards and such use cards (playing cards or tarot cards) as training tools. The patterns created by certain layouts of cards are mnemonic devices to teach key elemental associations and paths. With such interesting names as the Tree of Life, Phoenix's tail, Rythm of Heart, and Balance of the sphere, there pattern represent the matrices used by magic users to focus and present power. Spell processes can be represented by a sequence of cards.
So mages will often be seen handing around hands of cards.
Wizards will have a deck of cards with them. Since cards were used to train wizards in legerdemain, Since they have cards with them, they frequently know how to use them. Guild magic users often have a knack for fancy shuffles, palming cards, and a variety of card tricks and games.