Unless you know Claudia and the type of person she was how can you be sure she would put jewelry on to meet a man. That seems extremely old fashioned IMO
You could apply that reasoning to any aspect of this case, i.e. we didn't know Claudia therefore everything we say is meaningless and pointless.
On the other hand, a general picture of the known actions of human beings gives an indication of how Claudia may have acted. Cannot be proven, but it gives an idea.
There is nothing old fashioned about a woman wearing her jewelry on a date while not wearing it at work. It's not exclusive to women either. Jewelry/watch is a form of self-expression, for both women and men, as is the clothes we wear. Both say a lot about the individual, whether consciously or otherwise.
Although this won't apply to everyone, given that a general rule never does, you will find there are very few women who buy jewelry and do not wear it when they go to see a suitor, and that being the case it is probable that Claudia left her jewelry behind because she had no intention of meeting a man when she left her front door.
She was a young woman who by all accounts had many nights out and met up with many men.
Not by all accounts at all; not by a long chalk. I hope you don't mind me borrowing your argument style: "we don't know Claudia therefore we cannot say". Actually, the people who reported these so-called "many men" didn't know Claudia at all, whereas the people who did know Claudia well, i.e. her family and her close mates, did not recognise the "many men" version of Claudia that was plastered all over the newspapers.
More likely she was taken from her home
All sorts of mental acrobatics has to take place to make this work. Look outs, cover ups, clean up operations, braking cars, people wearing a mac knocking on the door in the morning, bodies being ferried around in the middle of the night: all sorts of things going on there.
Statistically, it's very unlikely. Feel free to post similar incidents. We do know that women are abducted on the street while walking alone in the dark, however. We know this because Crimewatch was full of such incidents.
The jewelry is proof of nothing JMO
It's not proof, no, but it does suggest that Claudia left for work that morning (for the reasons mentioned above).