So I am almost done with my Harry Knitted Objects--my last one is going to be a Hogwarts Unity bracelet (beaded knitted bracelet). I am going to use each swarovski crystal beads in each house color. Ruby for Gryffindor, Emerald for Slytherin, (I've seen/read references to these specific jewels in the books relating to each house) I am assuming Ravenclaw is sapphire, and here's where I need advice: should use Yellow Topaz for Hufflepuff or Black Obsidian or diamond.
On a side note I have noticed that each house color paired with a precious metal: gold, silver, bronze, and coal(?)--now I am assuming that coal is being considered a metal--just by all the other pairing...what are y'alls thoughts on this?
Should I use topaz or obsidian?