It is currently sold at London Drugs (Canada).
Commercial diamond is diamond sold for money.
An area where diamond gemstones are bought and sold.
The "Crown of Light" diamond, is a diamond only sold at Diamond International. It is very beautiful.
Blue diamonds are extremely rare, the price for is usually determined by the auctions. For example The Wittelsbach Diamond was sold for record $24.3 million at auction in London in 2008. See the link below for more information on blue diamonds and their prices.
The Hope probably originated in Golconda, India, with an undocumented provenance until it was sold by Jean Baptiste Tavernier to French Royalty in the 1600s. According to Wikipedia: "Though [Tavernier] is best known for the discovery and sale of the 118-carat (24 g) blue diamond that he subsequently sold to Louis XIV of France, was stolen in 1792 and re-emerged in London as The Hope Diamond..." You can read more about its physical characteristics and its ownership history, below.
Address of Diamond Continental Bank in London
Margaret Diamond was born in 1916, in London, England, UK.
It is not possible to find out the rarity of a diamond that is sold online. The only way to figure it out, would be to purchase the diamond and then have a professional look at the diamond.
Hatton Garden, Camden town, London
First, you'd have to find such a diamond. This size and colour are uncommon, blue being one of the rarest diamond colours. Recently (21Oct2010), the Bulgari Blue Diamond, "...a triangular 10.95 carat Fancy Vivid blue diamond, (the largest such blue diamond of this cut ever offered at auction)," sold for $15.7 million or $1.4 million per carat. (From The Telegraph, London.)
Any such visible flaw would be removed in the diamond cutting process, if the diamond is to be sold as a gemstone.