These are a pair of 8k yellow gold cufflinks set with onyx. The ornaments measure 11/16” x ¾”. They weigh 10 grams or 0.32 troy ounces. They are marked 333 which is 8K. We also tested them, our acid doesn’t go that low, but there is some discoloration under 10k acid.  In good pre-owned condition.

They have some makers marks we don't recognize. xxar in a box formation, and a A with a wave line under it. 

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