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Material for the production of fashion jewellery and jewellery stones with high refractive index and high thermal resistance is disclosed, the material being formed by the aluminium-silicate glass with the addition of rare-earth element oxides and niobium pentoxide and having the refractive index of at least 1.65, dispersion higher than 0.012, comprising in weight percent 0 - 30 % SiO 2 , 10 - 50 % Al 2 O 3 , 20 - 70 % Y 2 O 3 + La 2 O 3 , 0.1 - 20 % Nb 2 O 5 .