Answer:
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
I have a straight back and sharp teeth to cut objects.
I am a word. I become longer when the third letter is removed.
The higher I climb, the hotter I engage. I cannot escape my crystal cage. What am I?
My first part compliments people. My second part makes things known. My third part hurts feelings. My fourth part may hold a precious treasure. My fifth part is used when sharing fancy beverages.
The answer I give is yes, but what I mean is no. What was the question?