Here's what you might be looking for:
* Karat (K): This indicates the purity of the gold. For example, 14K gold means the necklace is 14/24 parts gold.
* Hallmarks: These are small markings that identify the manufacturer or the country of origin. They often include the karat mark and other symbols.
* Weight: This might be expressed as grams (g) or ounces (oz).
To identify the marking you're seeing, please provide the following information:
* A clear picture of the mark: This will help determine the exact characters.
* The context: Where did you see the marking (on a label, on the necklace itself, etc.)?
With more information, I can help you decipher the marking and understand what it means.