Ancient JATIM Indo-Pacific Trade Glass Beads in dark blue M00675

Ancient Indo-Pacific Trade fluted beads, known as JATIM glass beads in dark blue. JATIM is short for Java Timor or East Java which is the origin of these beads. They are believed to date back to the period between the 5th and the 8th centuries. The fluted shape is what the  locals refer to as a "starfruit".  It is possible that the beads were carved more recently to give them fluted shape,  but the glass appears to be ancient based on the view under the microscope. Similar beads are  shown on page 70 in the Bead Timeline book by James W. Lankton (Fig 7.8 - 923).  Please refer to the important note down below. The beads are ancient and somewhat irregular in shape. Every bead is unique.   Bead Size: Length: 16mm - 21mm Diameter: 18.5mm - 19.5mm Hole size: 4mm Weight: 234g Length of strand including stringing material: 27 inches Number of beads: 33beads Weights and sizes are approximate. IMPORTANT NOTE. It is known that in the last 2-3 decades a new bead-making industry in Indonesia has b