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How to Estimate Karat of Gold..??

How to estimate karat of gold.This is a simple formula to estimate karat gold :

 9 karat gold is 9/24 = 0.375; 37.5% pure gold
 10 karat gold is 10/24= 0.417; 41.7% pure gold
 12 karat gold is 12/24= 0.500; 50% pure gold
 14 karat gold is 14/24= 0.583; 58.3% pure gold
 18 karat gold is 18/24= 0.750; 75% pure gold
 22 karat gold is 22/24= 0.917; 91.7% pure gold
 24 karat gold is 24/24= 1.00; 100% pure gold

Gold filled jewelry and decorative items.

1/10 12 karat = 0.10 time’s total weight of object times the karat percentage.
1/20 14 karat = 0.05 time’s total weight of object times the karat percentage

Example = 1/20 gold filled 12 karat ring that weighs 8 grams.

0.05 x 8 x 0.5 = 0.2 grams of (theoretical) pure gold in ring.

Filled Value x Weight x Karat = Weight pure 24kt gold

Gold rolled (heavy plated) jewelry and decorative items

1/100 to 1/40 total weigh times the karat rating of item.

Example = 1/100 gold rolled (plated) 14 Karat ring that weighs 3 grams.

0.01 x 3 x 0.583 = 0.0175 grams of (theoretical) pure gold in ring.

Rolled Value x Weight x Karat = Weight pure 24kt Gold.