A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,409
These criteria are closer to the old Marriott lifetime criteria while the ten years as a Diamond parallels the SPG requirement of ten (not necessarily consecutive) years as Plat (plus 500 nights) for lifetime PlatMinus status.
I'm surprised that no one has made a literary reference (or joke) about diamond appearing at one thousand and one nights.