According to the citation in Wikipedia, below:
"In 1905, transport from South Africa to England posed a security problem. Detectives from London were placed on a steamboat that was rumoured to carry the stone, but this was a diversionary tactic. The stone on that ship was a fake, meant to attract those who would be interested in stealing it. The actual diamond was sent to England in a plain box via parcel post, albeit registered."
1000 turkeys were raised in the worlds largest turkey farm in England =)
England
The Tiffany Yellow Diamond is the worlds second largest canary yellow diamond. In 1983 the diamond was appraised and valued at 12 million dollars.
The largest supplier of raw, mined diamonds is probably the DeBeers organization. Read more about them, below.
Iron ore(World's largest supplier), Coal(Worlds largest Supplier), Bauxite(Worlds largest supplier), Gold(worlds largest nugget), Copper, Tin, Opals(worlds only source of black opal), Diamonds(2nd largest after south Africa but produces yellow diamond valued for industrial use), Uranium(worlds largest supplier) Natural gas(worlds largest supplier) Oil and Shale oil, magnesium, manganese, zinc, salt, nickle, mineral sands
England,
You can review the list, below, of named diamonds, none with the exact carat weight you describe, and documentation of the fact that a 99 carat diamond is not quite the world's largest.
The largest natural diamond found to date weighed more than 3,000 carats, and fit into the palm of a grown man's hand.
Vermont; Battle of Bennington Marker
Probably Plymouth Ho near Plymouth England. The guiness book of records does not contain an entry for the worlds largest garden implement.
Worlds largest animal: Blue Whale
worlds largest producer of nickel