It's hard to believe that it's almost a decade-and-a-half since the death of Diana Princess of Wales, in a car crash in Paris's Pont de l'Alma road tunnel with her boyfriend Dodi Al-Fayed.
As millions watched the funeral of the Royal they called "The People's Princess" one thing was clear: Diana's legacy as a popular icon and humanitarian was going to endure.
And, as with any strong legacy, the onus falls on collectors to help preserve it - which has lead to an increase in the values of her collectibles. For instance, Diana's autograph has appreciated by 580% over the last 10 years.
In other words, if you had bought a Diana signature for £1,250 in the year 2000, it could today be worth around £8,500.
Princess Diana at her first official appearance with Prince Charles,
1981. This dress later sold for £192,000 (See our full report here)
In fact, Diana autographs can command values anywhere up to $20,000 or more on today's markets - and their values will continue to appreciate.
Following Buckingham Palace's official announcement of her engagement to Prince Charles on February 24, 1981, Diana was rarely out of the spotlight.
As a result, a number of important memorabilia items have cropped up on the private markets over the last 13 years from the various 'iconic' episodes of her life.
For instance, a black dress worn by Diana - remembered by some as the dress which made her famous - sold earlier this year at London's Kerry Taylor Auctions for £192,000.
For its lucky buyer, the dress isn't only a one-of-a-kind piece of history, but will also prove to be a solid and reliable investment.
After all, if a Diana autograph's value can appreciate by 580% in 10 years, then imagine what a signed photographic portrait worth £12,500 ($20,625) today could be worth in another decade.
For now, Royal memorabilia remains one of the most confidence-inspiring collectibles niches, likely to be of interest to museums and high profile collectors in future years.
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