There are two equips in Japanese that have both been translated as Golden Sword. The first is きんきらの剣 [kinkira no tsurugi] or 'gaudy sword' in Japanese. The second is ゴールドソード [gold sword].
Final Fantasy III

Stats: ATK 5, ACC 20, weight 1
Use: FRE, ONK, WAR, RDM, KNT, DRK
Treasure: Goldor's Manor
Type: Sword
Other: きんきらの剣 in Japanese
Record Keeper

Gold Sword (VII)
Stats: ATK +55, ACC 95 (lv1), ? (lv5), ? (lv10), ? (lv15), ? (lv20), ? (lv25), ATK +100, ACC 95 (lv30)
Max Level: lv20 (initial), lv25 (first evolve), lv30 (second evolve)
Type: Sword, Rarity: ★★★★★
Other: ゴールドソード in Japanese
Other: note that while this equip is tagged as FF7, FF7 itself doesn't have anything called 'gold sword' in it
Category: Equipment