Glass was an advanced art among the Turks in Central Asia. They transported their own skill and taste wherever they conquered and settled and added it to local art, raising it to to new highs. The Seljuks were well known for their raised glass called semsiye. They used both blown and wheel-turned glass techniques and decorated them with incised motifs (oyma), engraving (kesme) and lustre (perdahlama).
The Ottomans improved upon the art by innovating new tecniques. Glassworkers were organized into a powerful guild, protected by the goverment and they participated in royal ceremonies as shown in the miniatures below.
Reference: Bayramoglu, Fuat. Turkish Glass Art and Beykoz-ware. Istanbul Matbaasi, 1976.
Some selected examples (please click on pictures to enlarge):