The Temple of Freyja is located on the island of Hindarsfjall, in the grove knownn as Hindar, in Skellige. The high priestess there is called Modron Sigrdrifa. The building itself is described as follows:
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Inside, a towering statue of Modron Freyja, the Great Mother, dominated the view, and in her arms, the diamond, Brisingamen.
The Witcher 3: Wild Hunt
In third game Freya's Temple is located closely to Freya's Garden, a few priestesses and worshipers are located her but interior is not available due to concerns about the possible theft of the famous diamond, Brisingamen, ornamenting the goddess' statue.[1] Its also said that it was Otkell, legendary forefather of both Skellige and Clan Heymaey, who erected a beautiful temple for her help.[2]