Among them are a 8.2-carat blue sapphire ring, set to go for anywhere from $300,000-$500,000, and a 10.95-carat round brilliant-cut diamond set in gold, which will go for somewhere between $40,000 ...

The Princess of Wales owns the most expensive ring: Princess Diana's iconic 12-carat oval-cut Ceylon blue sapphire, surrounded by 14 round-cut solitaire diamonds, all set in 18-carat white gold.