Spell: mass resonate
Spellcost: 380 spell points
Time: rather long time
This is a grand version of the spell resonate. With this spell it is possible to identify multiple gems at the same time. The power of the glyph, the amount of intelligence the caster has and the level of mineral lore all affect to the amount of gems you can identify with one spell.
This spell requires a powerful glyph of dimension.