Ring says YUBIWA in Japanese. The word Yubi means fingers, and Wa does ring, circle, or loop. Something ring-shaped for a finger, that makes Yubiwa!
Kanji Letters and Hiragana for Ring in Japanese
Here’s the Kanji letters for Yubiwa.
Hiragana letters are here.
Engagement ring says KONYAKU YUBIWA. Kon stands for a wedding, and YAKU means a promise.
Marriage ring is KEKKON YUBIWA. Kekkon means to marry in Japanese.