Skeleton Key- Razored. It was made to help me learn how to cut more complicated shapes.
Diamond- Ended up cracking in two places. Plus, I forgot to razor out the last triangle, but shhhhh.
Warning: Be careful with the Scalpel/Razor. I accidentally cut my fingers in three places. The razor is SHARP, and you don't notice it cut you until you see it. It'll hurt later, trust me.