The collection of medieval glass from Tigranakert city in Artsakh is consists of 1545 items. Fragments of medieval glassware were found in the cultural layers of the 5th-7th, 9th-11th and 12th-13th centuries in the Central District, as well as in the 12th-13th century layer in the Fortified District. It should be noted, that the remains of glass production - the furnace and the stone smelter for glass - were opened in the excavation of the Medieval Square in the Central District. This indicated on the local production of glass. The furnace is round laid out from bricked in 5 rows: the bricks are burnt, many are broken in to half. The inner diameter of the furnace is 0.78 m. The inside of the furnace was filled with pieces of brick and tiles. This glass workshop probably belonged to the type where the glass was not boiled, but processed by melting pieces of glass. The small pieces of such glass were found in the excavation site. Judging by the excavation layer, it belonged to the early medieval period. The operating time of a similar furnace is limited by the 5-6 years, but the tradition of glass production was preserved later. So, manufacturing defects from glass bracelets production were found in the layers of the 11th-12th centuries. The whole mass of glass objects, according to the meaning of their use, can be divided into two groups: jewelry (bracelets and beads) and vessels, among which a group of oil lamps can be distinguished. Unfortunately, no complete vessels have been found and the glass fragments sometimes are quite small, so through them it is difficult to understand the shape and use of the vessels.