Shu'ayb (may Allah have mercy on him) said that Umar (may Allah be pleased with him) wrote to Abu Musa (may Allah be pleased with him) that he should tell the Muslim women under his charge to pay the zakah on their jewelry.
This is mursal (its chain is broken); Shu'ayb bin Yasar did not meet Umar.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7543
Shu'ayb bin Yasar said that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) wrote that zakah should be paid on jewelry.
Al-Bukhari said: It is mursal (its chain is broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7544
Urwah (may Allah have mercy on him) narrated from Sayyidah Aishah (may Allah be pleased with her) that there is no harm in wearing jewelry when its zakah is paid.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7545
Alqamah (may Allah have mercy on him) said that the wife of Abdullah (may Allah be pleased with him) asked about jewelry, and he said: When it reaches two hundred dirhams, zakah is due on it. She said: I will spend that zakah on my nephews who are under my care. He said: Very well.
This has also been narrated as marfu' (attributed to the Prophet (peace and blessings be upon him)), but that is of no weight.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7546