I like the Rubedo arrow best. I wear a gold arrow pendant myself (a Jennifer Meyer one). It was also available with diamonds but I think a detailed shape like an arrow is nicer in precious metal alone.
Jewellery is so personal. It should give your heart a flutter when you put it on. Of course you pay a high price for the Tiffany brand, but it's worth it
if the piece speaks to you. It's like love IMO - when you know, you know. If you are having doubts I would return the pavé piece and keep your $1,500 for something you feel sure about.
And lastly, do not worry about what others think. There's a lot of shiny costume jewellery out there, much of it very pretty. The casual observer doesn't know what's real platinum, diamonds, silver or cheaper plated stuff. Most fine jewellery is small and subtle and you should wear it for yourself, not because other people will stop in their tracks. Many are not that detail-oriented or simply not attuned to jewellery. Doesn't mean it's not beautiful
Sorry for rambling - this is a topic close to my heart!