all of Tiffany jewelry or really from any real designer company will be marked/stamped of some kind on the “gold” to know that it is real. Nobody is marking anything on the actual diamond. A certified diamond from tiffany means that “they” examined and evaluated that specific stone to have the standard and quality/color that tiffany advertises. its their haskama so to speak that u pay for.. which in real life didn’t change the item but its a feeling of security & people are willing to pay for that.
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