The arms above are a new emblazonment of the arms of the Royal House of Karađorđević (Karageorgevich) as created by Royal Heraldic Artist Ljubodrag Gurjich.
Below is the text on the work coming from the artist himself:
Performing my duties as the heraldic artist to the Royal House of Karadjordjevic I worked on the new emblazonment of the house coat of arms of the House of Karadjeordjevic during December 2011 and January 2012. The Herald of the House, Mr Dragomir Acovic, graciously gave me initial advice and his detailed reconstruction study of the Order of Saint Prince Lazar done in 1982, and then granted me full autonomy in execution of this work. The emblazonment was approved by the Head of the House, HRH Aleksandar II by the end of January, and was officially used for the first time on 14th February 2012.
This heraldic composition was first used in Serbdom in 1917 and the same blazon version was reconstituted in post-Yugoslav period.
As it is well known, Crown Prince Alexander is the current head of the dynasty and pretender to the Serbian throne.
Official website of the Royal House of Serbia: http://www.royalfamily.org/
Official website of Royal Heraldic Artist Ljubodrag Grujich: http://www.ljubodraggrujic.com/