Here's the site of the company mentioned above. It's a US based company that branched out to the UK...
http://www.lifegem.com/
Now when you have a loved one cremated, how do you know you're not going to get the remains from the previous person that was cremated in the process? I'd hate to wear a diamond with the thought that someone else's carbons could be in there.
Also, $14,000 for almost a karat is a tad bit outrageous.