A magnificent oval-cut crystal clear gem sits at the center of this mesmerizing ring. The band is made up of twisted gold and silver that wraps around the edges of the gem, allowing the wearer to feel the polished facets of the stone upon their finger as they wear it.

While wearing this ring you are able to discern magical spells cast by other creatures in your vicinity. The crystal gem glows with varied illumination and different hues depending upon the school and level of spells cast within 30 feet of you. The light given off by the ring increases from faint to very bright based upon the level of the detected spell; a cantrip causes the gem to glow very faintly, increasing to light akin to a bright candle at 5th, and as much as a torch for a 9th level spell. The coloration of the glow for the various schools of magic are as follows:

Abjuration: Golden Yellow
Conjuration: Emerald Green
Divination: Bone White
Enchantment: Sparkling Silver
Evocation: Fiery Red
Illusion: Pearlescent Lavender
Necromancy: Slate Gray
Transmutation: Amethyst Purple

The magic of the ring is also such that you know the school and level of the spell regardless of whether you see the glow of the crystal. Others that observe the ring can possibly understand the indications of the ring if they are astute enough magically (DC 15 Intelligence (Arcana) check).

You can also, as a reaction, make an Intelligence (Arcana) check to discern who casted the spell detected by the ring. The DC for this check is 10 + the level of the spell cast (Cantrips count as 0 in this case).