The bunch is large, cylindrical-conical and compact. The grapes are dark-blue to bluish-black and their skins are thin and frail. Gamza is a late-ripening variety – it ripens at the end of September or beginning of October. However, in the Vidin area in north-western Bulgaria, the grapes achieve technological maturity earlier – around September – because the accumulation of sugar is more intense. In general, Gamza thrives best at windy hills with rich soils. Because of the thin skin of the grapes, they are prone to developing fungi such as grey mould. For instance, if the autumn is quite humid, the grapes tend to get this disease. Thus, Gamza requires a warm and dry autumn in order for the wines to be of good quality. Gamza is not particularly resilient to low winter temperatures, although it prefers cooler climates which is the reason why it is mostly cultivated in northern Bulgaria.
Table and dessert red wines are produced from Gamza. The wines are full-bodied and harmonious, but their quality is highly dependent on the climatic conditions, especially in the autumn. When the autumn is dry and warm, the wines from Gamza have a vivid, although not very dense, ruby colour, a pleasant taste of small red fruits, most notably raspberry, distinct freshness and delicate tannins.