Trap the Soul

Note that items with the Trap the Soul (item enhancement) have no Hit Die requirement or material component.

Soul Gem cost
One small Cost 500 fragment One average cost 1250 fragment

You can usually find 1 fragment for 1pp on AH.

Soul Gem distribution notice
When in a group the soul gems you create by using this spell can be picked up by any member of the party. This should be considered before using this relatively expensive spell.

=Soul Gems reported= Soul Gems may be used in the Stone of Change (Adamantine Rituals use Soul Gem: Essence of Earth), and Cannith Crafting; see Crafting Soul Gems for a list. Soul Gems can be stored in Small or Medium Soul Bags.

Reference

 * Trap the Soul, 20-30 HD results thread, by Angelus_dead
 * List of Soul Gems (colors, description text)