Yggdrasil, the tree of life (Norse mythology). Its many roots and limbs keep all the different worlds together: Asgard, Midgard, Helheim, Niflheim, Muspellheim, Svartalfheim, Alfheim, Vanaheim and Jotunheim. Below its roots there is the spring that fills Mímisbrunnr, the well of wisdom, guarded by Mímir.
Pearl is the symbol of kindness, loyalty and justice. It absorbs negative energy and calms its owner. It indicates innocence, purity and modesty.