It is uncommon, but real gold sometimes has no markings or hallmarks. Hallmarks are stamps or markings that indicate the purity of the gold and are typically required by law in many countries. However, this requirement has some exceptions, and some jewelers or manufacturers may choose not to mark their gold jewelry for various reasons.
In cases where gold jewelry has no markings, it can be challenging to determine the purity of the gold. A reputable jeweler or appraiser can perform tests to verify the purity of the gold, such as acid testing or X-ray fluorescence testing. However, these tests may be more expensive and time-consuming than checking the hallmark.
Suppose you are purchasing gold jewelry and are concerned about the authenticity of the gold. In that case, work with a reputable jeweler to ask questions about the purity and origin of the gold. You can also ask for documentation or certifications that verify the authenticity of the gold, such as a grading report from a reputable laboratory or a certificate of authenticity from the manufacturer.