D. Swarovski Kg

D. Swarovski & Co.

Johannes Maier

Gerold Sprachmann

Florian Meissl

Markus Sauer

Rainer Haid

Stefan Prowatke

Roy Debbage

Helmut Judmaier

Adolf Stocker

The invention relates to faceted gemstones based on a luminescent glass composition that contains particular oxides of rare earth metals and thus enables the faceted gemstones to be identified, and to a process for identifying the gemstones.

Luminescent glass composition

The invention relates to red-dyed glass, comprising the components of a base glass, coloring additives, reductants, and stabilizers, wherein the coloring additives comprise copper oxides and neodymium oxides and wherein the reductants comprise tin oxides and wherein the stabilizers comprise antimony oxides, wherein the fraction of the copper oxides in the red-dyed glass is between 0.02 and 0.08 weight percent.

Red-dyed glass and method for producing same

A lead- and barium-free crystal glass having a refractive index of at least 1.55, with in % by weight, more than 50% and less than 60% SiO, more than 0.6% and less than 4% BO, less than 3% KO, more than 12% and less than 15% NaO, more than 4% and less than 11% CaO, more than 0.25% and less than 5% AlO, less than 2% MgO, and between 8 and 16% ZnO, with the proviso that the total content of the oxides of Pb, Ba and As is below 0.1%, the total content of the oxides of Ti and La is below 5% and the total content of the oxides of Nb, Ta, Yb, Y, W, Bi and Zr is below 5%, wherein at most 1% oxides of Nb, Ta and Yb respectively and 3% of the oxides of Y, W, Bi and Zr respectively are included.

Lead- and barium-free crystal glass

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Innsbruck, Austria

Johannes Maier