white gold art deco ring

ring marks?
I just bought a white gold deco ring art, but has no brand on it, which means that the dose have some type of drilling
The feature means that its state independently tested for gold content, etc, which also helps to know who made the ring, for example, a designer or company. If you have not stamped you can not sell or insure that 24carats gold or something like a gold ring. It could reduce the value, but it really depends on how the ring is first.