Palladium - @Borancili

With an original design by Michael Leach, Palladium, formerly Project Orca, is thought to be owned by Mikhail Prokhorov, Russian oligarch and owner of the Brooklyn Nets. Palladium is a 95.15m luxury motor yacht which was built by Blohm + Voss in 2010. With a beam of 16.00m and a draft of 4.40m, the yacht has a steel hull and aluminium superstructure.
Topaz - Yvan Grubsky

Launched in May 2012 by Lurssen, Topaz picks up the spot of 6th largest yacht in the world. The megayacht has a beam of 21.5m and 5.7m, this adds up to a gross tonnage of 11,589 tones with her steel hull and aluminum superstructure. Topaz features an exterior design by Tim Heywood and interior style by Terence Disdale.
A - Jarrad M Yates

M/Y A was built by Blohm+Voss in 2008. Designed by Philippe Starck, the vessel remains the most talked-about yacht on the seas. A is capable of accommodating 14 guests in 7 luxurious cabins, as well as a crew of 42.

Officially the largest yacht measured by gross tonnage Dilbar has been recently spotted in Sardinia. 156m yacht was launched by Lurssen in November 2015 and was reportedly built for Russian billionaire Alisher Usmanov. It is understood that her exterior design is by Espen Oeino with interiors by Andrew Winch.
Katara - Julien Hubert

Built by Lurssen in 2010 as Project Crystal, Katara is a 124 meter luxury motor yacht. Reportedly, her exterior design was done by Espen Oeino and her interior design by Alberto Pinto. Featuring a helipad and two life rafts on her upper decks, it is speculated that the yacht has a two-deck-high main salon on her aft. Katara flies under the Qatari flag and her home port is Doha.