DeBeers may be the most famous brand, with its Forever mark. Also Tiffany and Canadia are other brands.
A branded stone generally identifies it with access to its diamond qualities: cut, colour, carat size and clarity, and may also identify its country of origin.
Best is a judgment and you are the judge. Not all diamonds are branded.
There are several companies that create synthetic diamonds or cultured diamonds. One such company that creates the best synthetic diamonds is New World Diamonds.
I like Diamonique from QVC. They have a Tacori collection that is beautiful!
LeVian is apparently a branding scheme/ brand name for brown diamonds.
Diamonesk diamonds are not real diamonds. They are stones that are made to look like real diamonds. They are a brand of diamond ring.
One can assume that LeVian diamonds are mined and not grown in a lab. Your LeVian retailer can confirm the source of the diamonds you purchase under this brand.
Debeers diamonds are the standard by which most diamonds are measured.
Alrosa russia and India have the best producing diamonds
Diamonds Are a Girl's Best Friend was created in 1949.
Diamonds are a girls best firend
Impurities in diamonds, in this case nitrogen, gives the diamond a yellow tint. Champagne colour may be a brand name, in the same way that Chocolate Diamonds are a brand name for a specific colour and saturation of colour, all caused by nitrogen impurities in the gem.
The statement that best describes the formation of diamonds could be "Diamonds are formed by pressure, weight, and high temperature of overlying rocks."
Apparently, your local KMart offers their brand -- Orange Blossom -- of diamonds. You can shop there to find the diamond you want.