Jan 17th, 2013
The Edcora Red is a 5.71 carat red modified pear-shaped diamond (GIA graded as a fancy red-brown). It is claimed to be the largest known red diamond in the world, and its owners have certainly hidden this one away from the rest of the world- we can’t even find any images to showcase this legendary diamond .
Very little is known other than its last known location which is in Hong Kong somewhere.
Natural red diamonds are so rare that most jewellers have never seen one, and will probably never own one. In recent years, methods of producing (growing) intensely colored diamonds, including fancy red, have been developed, although to date, the solitary one that we have cut and polished on contract to a Customer was very disappointing. The process recreates the conditions which existed millions of years ago to produce fancy colored stones, but getting the colors exactly right is a science that is still being explored. The treatment can only work with a small minority of diamonds, and involves irradiating them causing the color to change, usually followed by heat treatment to stabilize the color.
Red diamonds are expected to continue gaining value over their other colored counterparts.