SRD:Shard

Shards: These universal items are tiny fragments of cast-off crystal imprinted with minuscule bits of psionic power. Using a shard requires grasping it and projecting a command thought as a standard action (most shards telepathically whisper their command word into the minds of living creatures who handle them). A shard grants a temporary competence bonus on one specific skill, ranging from +1 to +10. The granted bonus lasts until the skill is used or 10 rounds pass, whichever comes first. Once its effect is activated, a shard disintegrates immediately, whether or not the bonus granted by the shard is eventually used.

Moderate psychometabolism; ML 7th; Craft Universal Item, creator must have ranks in the specified skill at least equal to the imprinted bonus; Price 10 gp (+1), 40 gp (+2), 90 gp (+3), 160 gp (+4), 250 gp (+5), 360 gp (+6), 490 gp (+7), 640 gp (+8), 810 gp (+9), or 1,000 gp (+10).