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Message: <blockquote data-quote="headbut" data-source="post: 35545" data-attributes="member: 569">Have found the formula , just need scales I can put in water Now you have the dry weight and the wet weight of the specimen. Use the following calculation to calculate the amount of gold in your specimen.- Subtract the wet weight from the dry weight and note the difference (D).- Divide the dry weight by (D) and write down the result (SG) which is the specific gravity of the specimen.- Subtract the specific gravity of quartz (2.60 to 2.65) from (SG) to get the result (R). The specific gravity of quartz varies from 2.60 to 2.65 because some quartz is more dense than others. This variation does not affect the result greatly, but it does show that the calculation, though close, will never be 100% accurate.- Multiply the result (R) by (D) to get a result (R2).- Divide (R2) by 25.97, which will give you the contained amount of gold in the specimen in ounces.- Multiply the contained amount of gold in ounces by 31.103 to get the contained amount of gold in grams.</blockquote>