Jokes aside, typically its either a promise ring, or just ring.
Just say "I will give you my ring". Its easier, and avoids implications.
"Promise Ring" is usually reserved for those who are planning to get married, but the guy can't afford a real diamond ring, so the Promise Ring is given in the interim.
Like I said, just say "I will give you my ring". The implications are known.
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*Joren, Legend, Alleged Egomaniac, Thread-Killer, 2-time Ban Recipient, and 6th Grade Spelling Champ*
*Joren, Legend, Alleged Egomaniac, Thread-Killer, 3-time Ban Recipient, and 6th Grade Spelling Champ*