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OTC Ltd. is the company that made the piece of jewelry. From what I understand they have become quite a force in the jewelry industry. They now have fine gold, diamond and silver jewelry as well as nicer costume jewelry.
The letters in jewelry usually stand for the person who made it or the company. The 925 is the silver content of the jewelry. At 925 you have sterling silver and that is good.
GW Silver is a company making silver jewelries.
When jewelry has 10KCAL stamped on it, the 10K means that the jewelry is 10 karat. The CAL is a mark that shows the company that made the piece.
The SK stamp on jewelry is the initials or mark of the maker or manufacturer. Often letters are stamped inside jewelry to show who made it.
A "J" stamped on jewelry could mean that the manufacturer was Jardinay. Jardinay is a very popular jewelry company located in New York, New York.
RA is the initial of the company that made it. The initials might not be registered.
The letters STGPPC stamped on jewelry refers to two separate items. STG is an abbreviation for sterling. PPC is the manufacturer of the piece. PPC stands for Princess Pride Creations.
I read somewhere that it meant Silver Unlimited and that it is a company that makes jewelry. Hope this helps.
If a piece of jewelry is stamped with OTC 925, the OTC stamp is the name of the company that made the jewelry, OTC International. 925 is a common stamp on all sterling silver.
JewelAmerica stamps ZRW on the inside of their jewelry. JewelAmerica is a vendor that mass produces different kinds of jewelry.
I was told the NR is for Natural Round, this means the diamonds are not from a lab and are worth way more than the lab ones.