The two varieties are interspecific new varieties created in 1964 by the breeder Vilém Kraus (1924-2013) in the former Czechoslovakia. The white grape variety GM 6493 is a cross between Zarya Severa x Muscat Ottonel, the red grape variety GM 6494 is a cross between Zarya Severa x St. Laurent. Both hybrids contain genes of Vitis amurensis and Vitis vinifera. Both varieties are characterised by high resistance to both mildew fungi and frost hardiness. Kraus offered some vine seeds to Dr. Helmut Becker (1927-1990), then head of the Geisenheim (Rheingau) Vine Institute, who recognized the importance of the breeding material and made selections. It was only here that they were given their present names and also reached other institutes.
During later research, the head of the State Institute in Freiburg (Baden-Württemberg) Norbert Becker (1937-2012) wrongly assumed Saperavi Severny (instead of Zarya Severa) as the mother variety for GM 6493 and GM 6494. Only in 2003 his successor Dr. Volker Joerger cleared up this mistake. Due to the high performance of the seedling 6494-5, the variety GM 6494 was selected and later propagated as an independent grape variety under the name Rondo. Variety GM 6493 was a crossing partner in the new Solaris breeding, variety GM 6494 in the new Bronner breeding.