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promise ring
gen.	перстень обіцянки (зазвичай символізує обіцянку заручин (pre-engagement ring, sometimes referred to as a friendship ring): Rachel had a party she wanted to attend with her new boyfriend, who had given her a promise ring wikipedia.org bojana); каблучка обіцянки (зазвичай символізує обіцянку заручин (pre-engagement ring, sometimes referred to as a friendship ring): Rachel had a party she wanted to attend with her new boyfriend, who had given her a promise ring wikipedia.org bojana)
English thesaurus
promise ring
jewl.	A ring given to another or worn by the purchaser that symbolizes a promise or vow. Commonly worn by couples, friends or those who take a vow to remain pure. The latter are also called purity rings.