Where is the zLF logo of Leofoo diamond ring engraved?

Usually stamped on the inner wall of the ring.

ZLF: It's short for Leofoo. It is usually imprinted on the inner wall of the ring. PT is platinum, just as gold is AU. 990 is pure, and the ring is made of PT950, which has higher hardness. However, there are many models of 990, depending on the style.

ZLF is Leofoo pt990, which is the platinum content of platinum products.

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