Follow Ups/Extra Information. Most recent is listed first.

'Buyer' didn't want to meet up in person, and didn't seem to realise their proximity to me when discussing distance (my address and their phony one was about 20 minutes away)
Scammer offered a way too reasonable amount extra for shipping ($200), and wanted the item (diamond ring) sent to her daughter in China When discussing shipping, they said to send it as "items returned to owner" to prevent tax in China.
After requesting a payment, I received an email but my pay pal account didn't update on the site, there was no record there.
Last thing I checked was the email, it came from 'service@paypal.com.au' but was actually (support@contactpaypalservice.com) - after googling that I found a whole bunch of scam stories that were almost identical.
Buyer does not contact through sale site (in my case, Gumtree) Buyer agrees to first counter offer. Buyer offers $200 for shipping to CHINA Buyer asks for a money request in pay pal Buyer claims money has been sent and the phony email arrives from support@contactpaypalservice.com
Can never be too careful people!

EBAY - buying a diamond
Same as previous reports on FORMEMMA@GMAIL.COM
Wanted to buy a diamond, willing to pay $200 for postage, Sent fake PAYPAL confirmation email to state payment had cleared Address:
Beijing China
DONT SEND ITEMS, SCAMMER ALET!!!!!