Answered by Shaykh Faraz Rabbani
Question: Can a Muslim woman wear a necklace, ring, or other such jewelry with the name of Allah written on it?
Answer: In the Name of Allah, Most Merciful
Yes, it is permitted for women to wear such jewelry. [Ibn Abidin, Radd al-Muhtar]
However, it needs to be covered up (or taken off) before entering toilets. [ibid.; Shurunbulali, Imdad al-Fattah]
And Allah alone gives success.