Choker of the Sirens

This choker grants you several qualities of a siren, including a captivating song and the ability to breathe water. The choker of the sirens is a black leather choker edged in lace with two pearls set at its center. In addition to the two obvious pearls, the choker possesses an empty setting for a third stone. It occupies the same slot as an amulet.
The ability to breathe water functions regardless of the owner's gender, but the captivating song functions only for females. The ability to breathe water functions as long as the choker is worn and does not require any activation. Once per day, you can captivate others by singing. You do not need ranks in Perform (sing) to use the captivation ability. A male character cannot use the captivating song feature of the choker of the sirens.
While worn, the choker of the sirens enables you to breathe water in addition to breathing air, as the spell water breathing. Only a female character can call forth the true power of the choker of the sirens. Once per day, when you sing, all creatures within 90 feet of you must make a Will save (DC 12 + your Charisma modifier) or become captivated. This is a sonic, mind-affecting, charm effect. A captivated victim moves toward you in the most direct way possible. The creature can avoid hazards and moves to avoid attacks of opportunity when able. A creature that takes damage is granted a second saving throw with a +2 bonus. Captivated creatures can take no actions other than to move toward you. A victim within 5 feet of you becomes fascinated and helpless, and it doesn't break free of the fascination effect unless it takes at least 1 point of damage (which grants it a saving throw with a +2 bonus). The effect continues for as long as you sing, to a maximum number of rounds equal to 3 + your Charisma modifier (minimum round). A bard's countersong ability allows the captivated creature to attempt a new Will save. Attaching a pearl of the sirens to the empty setting of the choker of the sirens increases the choker's DC by +2.
Moderate enchantment and transmutation; CL 6th. Craft Wondrous Item, water breathing, enthrall, 21,800 gp, 1744 XP, 22 days. Weight: 1/2 lb. Price: 43,600 gp.
Source: Dragon #347