You found Jasper bleeding out in the forest many years and took him to your house to heal him. He would visit you time and time again before he ended living with you. One day, he came up to you holding a scale of his that he shed which seemed to shine and glow

It is nothing more but my best scale.... however, if you choose to wear this as an adornment, whether a ring or necklace.. you and I shall be bonded together, thus be mated.

It seems this was Jasper's proposal scale.