星のペンダント [hoshi no pendant] or 'star pendant' in Japanese.
Final Fantasy VI
Stats: -
Equip: all
Obtain: ?
Description: Star-shaped pendant with a jewel at its center. Prevents poison.
Final Fantasy VII

Stats: immunity to poison
Buy: 4,000 gil (Sell: ? gil)
Shop: Gongaga
Drop: Motor Ball
Obtain: exchange for Coupon A in Shinra Building
Final Fantasy XIII-2
Star Pendant
Slot cost: 55
Ability: Resist Poison +66%, Accessory Ability Group: Debuff Duration
Buy: - (sell: 325 gil)
Treasure: Bresha Ruins (5 AF)
Drop: Svarog (3%)
Description: ?
Delicate Star Pendant
Slot cost: 35
Ability: Resist Poison +33%, Accessory Ability Group: Debuff Duration
Buy: 325 gil, Star Pendant, Tear of Remorse, Chocobo Plume x2 (sell: 162 gil)
Description: ?
Durable Star Pendant
Slot cost: 75
Ability: Resist Poison +100%, Accessory Ability Group: Debuff Duration
Buy: 1,300 gil, Star Pendant, Millerite (sell: 650 gil)
Description: ?
Crystal Chronicles
Stats: adds one heart
Obtain: Lynari Desert, cycle 1
Other: an Artifact
Record Keeper

Star Pendant (VII)
Stats: DEF +3, Poison resist (small), Max Level: 1
Type: Accessory, Rarity: ★★★

Star Pendant (X)
Stats: HP +300, Poison resist (moderate), Max Level: 1
Type: Accessory, Rarity: ★★★★
Category: Equipment