Rings.

The various rings are:

Right thumb: 零 rei, "zero"; worn by Pein.

Right index finger: 青龍 Seiryū, the Azure Dragon; worn by Deidara.

Right middle finger: 白虎 Byakko, the White Tiger; worn by Konan.

Right ring finger: 朱雀 Suzaku, the Vermilion Bird; worn by Itachi Uchiha.

Right little finger: 玄武 Genbu, the Black Tortoise; worn by Zetsu.

Left little finger: 空陳 Kūchin, the Void; formerly worn by Orochimaru.

Left ring finger: 南斗 Nanju, Sagittarius (lit. Southern Star); worn by Kisame Hoshigaki.

Left middle finger: 北斗 Hokuto, the Big Dipper (lit. Northern Star); worn by Kakuzu.

Left index finger: 三台 santai, "three levels"; worn by Hidan.

Left thumb: 玉女 gyokunyo, the Virgin; currently worn by Tobi, formerly worn by Sasori.

Itachi