Promise ring isn't an engagement ring instead having a same appearance and formations of designs. Still, promise rings are differs from the engagement rings.
A pre-engagement era for love relationship starts from exchanging a promise rings. While engagement rings offeres after a pre-engagement era, which means spouses already exchanged a promise ring or maybe not, depends on their mindsets.
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https://www.ourosjewels.com/blogs/topic/what-is-promise-ring-and-whats-their-types-indicate