Found this from 2003
Gold (2-5 Cruises)
A coupon book worth a couple of free drinks, discounts on photos, and casino match play
A quarterly newsletter/brochure that has had a few good dollars off coupons for selected future cruises.
Platinum (6-10 Cruises)
Special priority check in line
A "better than gold" coupon book (more good coupons)
Robe in the room
Open bar reception (we were invited to a 1 hour open bar reception at the Viking Crown lounge on our last Sovereign of the Seas cruise)
Priority disembarkation
Same newsletter, with higher value dollars off coupons
Diamond (11+ Cruises)
Special priority check in line
A "better than Platinum" coupon book
Robe in the room
Open bar reception (Plats/Diamonds were invited to a 1 hour open bar reception at the Viking Crown lounge on our last Sovereign of the Seas cruise)
Priority disembarkation
Same newsletter, with higher value dollars off coupons
Cabin Upgrades (friends on their last Voyager of the Seas cruise booked a cheap oceanview GTY category and received a suite.)