Is it real gold
Gold
Marks stamped on a ring may tell you the manufacturer as well as the composition and metal quality.
Gold
I donβt know
it mean 90 percent gold
As the Common Metal Marks Stamped Inside Rings, TI=Titanium
The GF stands for Gold Filled, as for PPG it's probably the company that gold came from
it means the metal is made of real silver
82.5% gold /silver what ever the metal is
375 stamped on any type of precious metal jewelry is generally an indicator of the percentage of precious metal. In your case, your silver is likely 37.5% silver.
Sterling stamped on any item is .925 silver and .075 other base metal.
That number indicates the fineness or purity of the metal content. 900 means the coin is 90% of that metal.
It is the purity of that metal. which means if you melt your metal you get 72.5% pure of that metal. Just like 916 for gold and 925 for silver.