1) Artificial gem paste 2) Glass for artificial gems 3) Material for paste jewelry 4) Paste for gems 5) Paste jewelry material 1) Paste 
paste for making false gems
• (n.) A brilliant glass, used in the manufacture of artificial paste gems, which consists essentially of a complex borosilicate of lead and potassium. Cf. Glass.
Glass containing a high amount of lead oxide and cut tosimulate a gemstone. Named for its inventor Josef Strass.
A high content leaded glass which is faceted to imitate diamonds or backed with colored foils to imitate other gemstones. Developed by Frederic Strauss in the 18th century.
Strass noun [ So called from its inventor, a German jeweler: confer French stras .] (Chemistry) A brilliant glass, used in the manufacture of artificial paste gems, which consists essentially of a complex borosilicate of lead and potassium. Confer Glass . 
a flint glass with a high lead content, used to imitate gemstones.