Naseeb Abdul Juma Issack (born 2 October 1989), popularly known by his stage name Diamond Platnumz, and often referred to as "Simba" (meaning Lion in Swahili) or "The King of Bongo-Flava" is a Tanzanian bongo flava recording artist, actor, dancer, philanthropist and a businessman from Tandale, Dar es Salaam. He is the founder and CEO of WCB Wasafi Record Label, Zoom Extra, Wasafi TV, a Tanzanian media outlet, and Wasafi Fm, one of Tanzania's latest radio stations.
Diamond Platnumz is among the most popular artists in East and Central Africa. He has had several hit songs and has been awarded numerous awards. He is the first Africa-based artist to reach a combined total of 900 million YouTube views. In 2013, according to Tanzania's mobile phone companies, he was the best selling artist of ringtones. Diamond is also one of the top earners in the African Great Lakes region's music industry.
Diamond is jointly managed by Sallam Ahmed Sharaff (Sallam SK) a.k.a. Don Mendez, Hamisi Shaban Taletale (Babu Tale) and Saidi Hassan Mlinge (Mkubwa Fella) from the Tanzanian music.
In 2021, Diamond together with his record label WCB Wasafi entered into a 360 Partnership with Warner Music Group.