My ring has the same thing engraved on it so I decided to call the store where I bought it from to get my question answered. What the store said is "the 10K represents the purity of the rings metal and the sp is the manufactures initials. Sometimes they put their initials on the jewelry."
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I have a ring that has crp 10k printed on the inside. What does it mean?
10k 512 means, you have a 10k gold ring with 5.12carat's total gem weight.
hj is company mark 10k means 41.7% gold content in total weight of the ring.
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I Believe It would be the ring being sterling silver with 10k black hills gold.