De Beers
This slogan began with DeBeers in the 1930s.
There is a brand name diamond simulant -- fake diamond -- named Asha Diamond.
Swiss Diamond appears to be a brand name for cookware.
Swiss Diamond appears to be a brand name for cookware.
Iliana is apparently a brand name for a diamond substitute gem -- a fake diamond.
You can shop for an 'Indian diamond', which appears to be a brand name.
Diamond ultra appears to be a brand name for a cubic zirconium stone.
Both refer to the same think: the signature of a brand, the sentence that delivers the company's vision and summarizes its positioning. The name tagline is used in the US whereas Baseline is used in the UK.
Practically, 'Italian diamond' is used to modify other words, such as jewelery. In this case, then, 'Italian diamond' could be a brand name.
Apparently, Leo Diamond is brand name for diamonds sold by Kay Jewelers. You can probably buy a Leo Diamond as large as you can afford.
There are many different locations in which someone can purchase brand name jewellery. The best places in which to go are the diamond store Zales and Kay.
Buzzfeed