Tauck has unveiled its two-year programme to reconfigure and relaunch five 110m jewel-class vessels.
The ships will have spacious cabins, fewer passengers and upgraded restaurants.
Tauck CEO Dan Mahar said: "From day-one our approach has always been to limit passenger capacity, and by doing so, to provide a more intimate, club-like atmosphere and more spacious cabins for our guests.
"The launch of our Inspiration Class ships took that approach to a new level, and with the re-envisioning of our Jewel Class vessels, we’re putting them on equal footing with our Inspiration Class ships."
Jewel Class comprises of Swiss Emerald, Swiss Sapphire, Swiss Jewel, Esprit and Treasures.
Tauck’s river fleet includes four 135m Inspiration Class ships, the new Grace and Joy launching later this year, and Inspire and Savor.
The Inspiration Class is planned to operate on the Danube River, or on the Rhine and Moselle Rivers.
The two-phase plan will first be implemented on the riverboats in FranceSwiss Emerald and Swiss Sapphire, which will be relaunched in 2017.
The remaining three ships will be relaunched in 2018.
Refurbishment will take place in the middle deck of the ship, Ruby, wherein the existing 30 150ft² cabins will be replaced with 20 225ft² rooms.
Tauck plans to include three cruise directors aboard each cruise.
The upper deck, named diamond, which happens to be the second dining venue of the ship will be upgraded.
Tauck plans to assign ships to destinations in accordance with their shape and size to facilitate easy passage of the vessel through the topography and easy docking.