Stones too convert into semi liquid form under a high temperature of say 3000 degree centigrade.
Pukhraj Stones are heated to a temperature of 3000 degree centigrade and at this temprature external elements like glass, beryllium or other external elements. Then this mixture is allowed to cool down. When these Pukhraj stones reach room temprature they show their changed colour and transperancy.
These Pukhraj Stones are termed as "Treated Pukhraj" or Bangkok Pukhraj because this treatment mostly takes place in Bangkok.