Grandmas Platinum and sapphire bracelet looks priceless, but the OB 14k means that it is 14k gold "overband" or later known as electroplate or 14k GP for Gold Plated. Crushed i set out to prove that at least we had sapphires. Alas, a pin scratched the gem which should be second only to diamond in hardness. Sorry to disappoint you, but your jewelry is old, but also not worth a lot, aside from sentimental significance.
OB 14k means that is a 14k Gold "overband," or more commonly known as Gold Plating or 14k GP.
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"14K G.O." Stands for 14K gold overlay. It is not solid 14K.
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