Clipping of ダイアモンド (daiamondo, “diamond”). Alternative form of ダイヤ (daiya).

big, large, great

a ring (round piece of (precious) metal worn around the finger)

(formal) Female third-person singular pronoun; she, her, girlfriend

(colloquial) a girlfriend (a female partner in a romantic relationship)

(literary) they (about women or girls)

attach itself to, stick, stick to, adhere, adhere to; be connected with / come in contact with, touch, reach / be attached to, belong to, join, associate with; take up the cause of

gain / become

(slang) Alternative form of 大きいお友達

a wedding ring