There are indications of sapphires and other forms of corundum.
The minerals of Siam include gold, silver, rubies, sapphires, tin, copper, iron, zinc and coal.
Sapphires are found in several gulches, especially on Yogo Creek, 16 m.
Rubies and sapphires are mined in the Chantabun district in the south-east.
It is a circlet of thick gold set with pearls, sapphires and other stones.