Kyhotae is correct here. Cards can only exist in their owner's Graveyard, so in your example Goldd goes to your opponent's Graveyard (because they are Goldd's owner). Then read what Kyhotae said.
EDIT: It was 2am when I wrote this post, and the wording of the question threw me a little. So I read it incorrectly. Here's what I should have said:
Goldd goes from your opponent's hand to your Graveyard. It was sent to your Graveyard by a card effect, so it is Special Summoned on your side of the field.
However, the card effect that sends Goldd to the Graveyard needs to be your opponent's if you want the second effect. It needs to be your opponent's compared to where Goldd was in a hand and in a Graveyard. It was your effect discarding it from your opponent's hand, so that's okay. However, the card effect is on the same side of the field as your Graveyard, so it's not an opponent's effect there. It's yours.
So Goldd would be Special Summoned to your side of the field, but it wouldn't get its second effect. That sounds about right.