Authenticating Tiffany Ring

[dudeman500]

Trying to understand how to get a ring from ebay authenticated in Australia

The price for this appears to be fair (maybe a slight premium for the tiffany name)
http://www.ebay.com.au/itm/281870177557?ru=http%3A%2F%2Fwww.ebay.com.au%2Fsch%2Fi.html%3F_nkw%3D281870177557%26_rdc%3D1


I've read a few threads but can't seem to find a good answer

Which is the best option
- Tiffany faq says no more appraisal, just replacement valuing, does this come at a cost? and will it authenticate?
- Go in with seller and ask for a clean - how long does a clean take? should i get the seller to drop it off for a clean and then go in with seller to collect the ring when they give it back?

Also will tiffany resize a second hand ring? The bottom thread suggests they will or would i have to go with the original owner?

http://www.tiffany.com.au/Service/FaqDetail.aspx?faq_id=2209&FAQ_CATEGORY=105%20&Search_Key=&
[URL='https://www.pricescope.com/community/threads/has-tiffany-changed-their-authentication-policy.183472/']https://www.pricescope.com/community/threads/has-tiffany-changed-their-authentication-policy.183472/[/URL]
[URL='https://www.pricescope.com/community/threads/tiffany-solitaire-resize-and-authentication-costs-policies.213982/']https://www.pricescope.com/community/threads/tiffany-solitaire-resize-and-authentication-costs-policies.213982/[/URL]