Question: who are de beers competitors?
Answer: Alrosa – Rough diamonds., Rio Tinto – Argyle Diamond Mine., Harry Winston – The One, Oval-Shaped Diamond Micropavé Engagement Ring., Tiffany & Co – The Tiffany® Setting Engagement Ring in Platinum., Cartier – Solitaire 1895., De Beers – Old Bond Street Solitaire Ring.