El Diamante Del Cielo Anejo Tequila - Anejo Tequilas are the smoothest and most expensive to produce. Their smooth and sophisticated oaky body and rich, bold flavor are the result of aging in small, government sealed oak barrels. To keep costs down, most Tequilas are bottled immediately. Although it is a much more expensive process, Cielo Anejo is aged up to four years - resulting in a smoother, more flavorful tequila perfect for sipping.