Fly Fishing Jewelry

Are you going to paraphrase this sentence for me?
I do not understand the part I capitalized: We learned that the gifts of mother never seems be. SMALL JEWELRY BOX with the promise of a Drop Dead Diamond already had a fly-fishing. Thanks
"With the promise of" media "Which seems to suggest (a good thing). "Drop-Dead" here means "incredible." A "fly fishing" is a lure to catch fish. Time a mother gave me a small box containing a diamond jewelry could expect beautiful, but inside it was a fly-fishing.
Fishing Stickers, Cupcakes, and Tiki Cat Culture
