That seems to be about a dog rather than an engagement ring. I'm with Judge Judy on this!
Though given the additional context I withdraw any reservations. Apologies for the interruption.
There are two parts to any legal case:
a) The facts of the case; and
b) the "ratio decidendi" (legal principle behind the decision). This can be based on statute (e.g. Sale of Goods Act, which ensures descriptions are accurate, goods are satisfactory quality etc.) or caselaw, e.g. Glaister-Carlisle, which creates tests to see whether a gift is valid - delivery coupled with intention to make gift, plus mental capacity (not raised as an issue in the case), plus proper formality, such as in sales of land.