There is a rich heritage of Islamic glass (10th-15th c.) in Syria, Egypt, Palestine and Spain. It can be divided into two periods:
1) glass from the reign of the Fatimids (9th-11th c.) resembles rock crystal in its transparent clarity. It is decorated by facet cutting and grinding often using patterns found on metal artefacts;
2) the 12th-14th c. saw the proliferation of Islamic ornament seen in intricate and variegated patterning, producing a fine play of colour.