More connections

More quiz type shenanigans, Only Connect styleee: 

1. What do these things have have in common?

gemstone
hair
5 pips
blaze

2. And these?

     **There was a fourth image, but Blogger
                                            won't display it. Picture, if you will,
                                            someone being murdered.  (Sort of hard to
                                            argue with them on that one.)



3. What comes next?


  

4: What would be fourth in this sequence:

A =101
B = One billion
C = One octillion

Answers in the comments please.  If anyone gets number three right I will be more impressed than you can possibly imagine, and not just with their ability to see connections.