This silver ring is forged in the shape of a dragon biting its own tail.

While wearing a ring of dragon friendship, you gain a +5 enhancement bonus on Diplomacy checks made to influence the attitudes of creatures of the dragon type.
In addition, once per day, you can activate the ring to produce a suggestion effect directed at a creature of the dragon type.
The effect functions as a 9th-level spell (as if affected by the Heighten Spell feat), and its Will save DC is 23.
If you or one of your allies attacks a dragon in any way (including using the ring’s suggestion power) while you wear the ring, it loses its powers for 24 hours, though any active suggestion effect continues working while the ring is inactive.

Prerequisites: Forge Ring, Heighten Spell, dominate monster, suggestion.
Cost to Create: 8,000 gp, 640 XP, 16 days.