Necklace of Prayer Beads

Wondrous item, Rare, Requires attunement by a cleric, druid, or paladin
This necklace has magical beads made from aquamarine, black pearl, or topaz. It also has many nonmagical beads made from a variety of minerals. If a magic bead is removed from the necklace, that bead loses its magic.
Each necklace can have a different set of 1d4+2 magic beads. To use a magic bead, you must be wearing the necklace. Each bead contains a spell that you can cast once, and you regain use of all beads at dawn.
Modifications: The spells use their usual casting time rather than a bonus action.