The Diamond Distillery sits on the East Bank of the Demerara River near Georgetown, Guyana. The Distillery was originally part of the Diamond Estate which was the last of the Sugar Plantation Estates in Guyana to produce rum. Now, of course, it is home to Demerara Distillers Ltd. (DDL) who are popular across the world for their rich, Demerara Rum.
The El Dorado 25 Year Old Vintage Reserve Rum is a blend of aged rums created to mark the turn of the millennium. It is blended from 25-year-old rum stocks which have been aged in used bourbon oak casks. I have been fortunate enough to have been allowed to taste this vintage rum on several different occasions over the past several years.
My review is based upon the most recent bottling available in here in Alberta, Canada, and that review score has placed the El Dorado 25 Year Old in the number 12 spot in my countdown of the Best Rums in the World.
Here is a link to my most recent review:
Review: El Dorado 25 Year Old Vintage
Every time I taste this rum, I am reminded of another great El Dorado Rum, the El Dorado Special Reserve 15 Year Old. It seems to me that these two rums must share a similar heritage. Although the El Dorado’s 15 Year Old Rum is wonderful, their 25 Year Old Rum raises the bar even higher. Its flavour is more refined and elegant, and as a result the rum is wonderful sipping experience.
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Note: You may follow my Countdown list of the 25 Best Rums of 2014 here: The Rum Howler – Top 25 Rums of 2014
According to the 
I am very near to the end of my white rum countdown and for the third time, (perhaps the fourth depending upon the origin of Potters Superior Rum), a rum from Demerara County in Guyana has found its way onto the list. This is no accident, as Demerara County (in Guyana) is popular across the world for its rich, three hundred year history of rum production. Using a combination of old wooden stills in conjunction with modern stills and distilling techniques, 
The El Dorado 3 Year Cask Aged Demerara Rum is blended from aged stocks (the youngest being no less than 3 years old) and then filtered twice through charcoal filters to produce a clear rum. All of the Demerara Rum produced by El Dorado is aged exclusively in American oak (bourbon barrels).
According to the 
The result is a fully aged, double-filtered, 6 Year Old White Rum. This rum is meant not just to compete with the new strain of super premium white rums that have entered the market recently, it is meant to compete head to head with the super premium luxury vodkas which have garnered a good chunk of the market share in the distilled spirits category.
The 
The Rum Howler Blog 