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Please take note the following for Thai Real Gold Casing as informed by Gold Shop. When sending in for Gold % test will have the following results: 
For 70% Real Gold - Gold test results estimated to be 50-65%, Silver, Copper etc mixed. 
For 90% Real Gold - Gold test results estimated to be 75% to 89%
As informed, the actual proportion of real gold % is usually lesser when gold maker do casing as they have to mixed in silver, copper and other materials to make the casing harder and more durable.

Real Gold casing 70% & 90%