John: "Baby, I love you and to prove my love I want you to have this promise ring. Now everyone will know that I love you."
Sally: "Ohh, John!! I love you too. I have to go make this my facebook status, and call my BFF Susie"
John: "Ok baby...call me later."
John: "Hey Susie, its John....she doesn't suspect a thing. I'm on my way...."
Susie: "I can't wait, me so horny...."
Sally: "Susie, guess what? John just gave me a promise ring!!! He loves me, and I was way off about him cheating on me."
The ring is normally on the cheaper side, with gemstones being more popular in them than engagement rings. Any diamonds are usually small and not of the highest quality, though they are legitimate diamonds.
Normally, it is seen as a commitment for teens, a promise that (usually) a guy makes to his significant other, promising that he will be faithful, that he will always be there, etc.
Some see it as a pre-engagement ring, where it isn't just the above, but also a promise to marry them when they get the money, and when they are ready for marriage.
it can also be given from a male best friend to a female best friend as a promise to always be there for them - though this case is a bit more rare, and can often be misunderstood.
The ring can also be given for religious reasons to a female from a family member as a promise to stay a virgin until marriage. It is also called a purity ring.
Ex 2: a gift of a Promise ring from a family member to a young female: "____, I want you to take this ring and wear it, as a reminder that Gods love is eternal for you, and that you should honor him and his commandments"