I believe these are exactly the same certificates offered here:
https://www.certificates.hyatt.com/p...CertsStay.aspx
...and you should be able to ask about them in the Gold Passport section of Flyertalk. Buying them with points rather than money shouldn't affect redemption.
Thanks. I'll probably call up Diners to see if they have any other info. Some things in the redemption list don't make sense such as:
Item Name Hyatt Hotels and Resorts Elite Stay--3 Nights
Item Number 6980h
Points 30,000
Versus
Item Name Hyatt Hotels and Resorts Elite Stay--1 Night
Item Number 6979h
Points 30,000
1 night stay is the same cost as 3-nights? Everything else seemed identical.