Remember: They had a contract of never falling in love with each other. She doesn't believe he'll ever like her considering his tastes usually go to blonde, busty and slutty females.
So giving her a gift like that just makes her think of two things:
1.) He likes her as a bed warmer, which is degrading.
2.) He usually gives extravagant gifts so there is no meaning to this.
And to be honest, he's been such an ass to every woman he dated, there's no wonder Lucia doubts him.
I, for one, would not be happy to flaunt jewelry where the giver treats me as a whore and not a beloved wife.
Preach!!
Why do I feel like it always too many chapters to get over this situation of bullshit,what I mean is if I had something that beautiful I would probably where it on special occasions with pride why reject the offer ....... not that I mean it doesn’t seem that he might give these gifts commonly,because everyone wants to feel like the gifts they get are especially made out to them(づ￣ ³￣)づ