The trademark DIAMOND is registered in Portugal. It's registry includes text/words. This trademark protects the use rights on natural agricultural products.
The record is owned by SCHELL & KAMPETER, INC..
(Hand tools) Hand tools and implements (hand operated); cutlery; side arms; razors. Class 31:
(Natural agricultural products) Agricultural, horticultural and forestry products and grains not included in other classes; living animals; fresh fruits and vegetables; seeds, natural plants and flowers; foodstuffs for animals, malt.