Tallulah Willis has unveiled her dazzling engagement ring in true romantic style, and it is every bit as enchanting and ...

An example is the old mine cut, which creates a squarish stone with rounded corners and a high crown (the top portion of the diamond), a style popular in the Georgian and Victorian eras.

One such expansion, known as Cut-9, is a $2 billion (£1.5bn) investment expected to extend the mine’s life to at least 2035 while yielding around 53 million carats of rough diamonds.