A ring, considered specifically as a symbol of commitment rather than just gold or jewelry generally, is read through partnership and wholeness — an unbroken circle, which is close to the most literal possible symbol for a lasting bond.
Receiving a ring is read as a commitment or partnership forming or deepening, whether romantic, business, or otherwise. Losing a ring is read with real emotional weight — fear of losing a commitment, or a real relationship currently feeling less secure than you'd like.
A broken or cracked ring is read as a partnership or commitment under genuine strain, worth taking seriously rather than dismissing as a random image, given how directly the metaphor maps onto the real relationship. Trying on several different rings without settling on one is read as weighing multiple options or partners, or feeling uncertain about which path or relationship is the right one to commit to right now.
A ring that fits perfectly and comfortably is read as confirmation — whatever commitment the dream is pointing to fits you well, a reassuring reading worth trusting if you're currently unsure about a real decision.