Rare Gold = 2 Thrones - See that mostly anywhere i go.
Rare Silver = 2 Thrones & 4 Hc's - Same with Rare Gold
Rare Bronze = 2 Trones & 6 Hc's

Dino Egg = 5 Thrones 5 Hc's - Seen a Couple of times.
Yellow Amber = 6 Thrones & 10-12 Hc's - Seen 2 Times.