You ask Ruuben about belt.
Ruuben tells you 'Oh, it's you again. Ah, that's right, I need you to bring
 me a star sapphire. And, it can't be too small! 'present jewel' if you
 actually manage to get ahold of one.'

look at sapphire 
This hemispherical sapphire is particularly interesting, because there is a
'star' of light hovering just above its surface. The star seems to glow with
an inner light that comes from the gem, shining with a quiet white light in
contrast to the gem's blue color.

Ruuben tells you 'Well, I'm somewhat impressed; this type of gem is not
 easy to come by. It will do wonderfully in my collection. I guess I'll go
 ahead and do some more work on your belt.'    

The Armourer takes your belt, and begins chanting over it. The second plate,
the one for the magnifying glass, begins to glow brightly. He finishes his
chanting and returns the belt.

Ruuben tells you 'There you go; come back soon for your next job.'