Here is ancient stunning aqua-color HEXAGONAL FACETED BARREL SHAPE BEAD or Diamond from Dvaravati period, excavated from Krabi province in southern of Thailand.
Condition : used, minor scratched on surface due to buried for a long time.
Date : 6th-7th century.
Material : blue quartz
Color : aquamarine
Size : 15mm.(long)x dia. (at middle) 18 mm. (see photo more detail