Tabula Rasa always generates with six jewel sockets[1]. It is only possible to socket non-unique regular jewels into this item. They can be removed or replaced freely. Time-lost jewels and unique jewels cannot be socketed.
While unidentified, this item will always display as having an "Exceptional" Garment base type. However, it can also drop with quality over 20%, but not with an additional rune socket.