Two planetary rings of Necromantic power.

Ring of the moon:

Cloth: White
Metal: Silver
Herb: Mullein
Stone: Quartz (clear)
Day: Monday on a Full moon.
Hour: 8 pm.
Use: Allowing for better spirit communication. 
Names of spirits:
Sylol
Millalu
Abuzaba

Ring of Jupiter:

Cloth: Blue
Metal: Tin
Herb: Mandrake
Stone: Amethyst 
Day: Thursday
Hour: 8 am/pm
Use: Authority over all spirits.
Names of spirits:
Hyrti
Ignaro
Quiron
Saalalebeth

The rings:

1) First acquire socketed bands of the metal required, ensure it can hold your stone in place.
2) Etch the characters of the planet along the inside of the ring. 
3) On the day and hour of the planet, place your herb in the socket and then the stone, securing the herb in place.
4) Bury the ring[s] on the grave of a child who lived for no more than nine years as they will be keen to serve.
5) After 31 days, dig up the rings put them on, evoke the spirits of the rings with the cloth and leave.

The cloths:
Take a silken cloth of the color of the planet and write the names of the spirits of that planet in fine red ink.

To evoke the powers of the rings, put the ring on, hold the cloth over your heart, pronounce the names of the spirits.

Bibliography:
Henry C. Agrippa - Four books of occult philosophy.
Unkown - Munich manual of demonic magic.
Scott Cunningham - Cunningham’s Encyclopedia of Crystal and Gem Magic.
Unknown - The black pullet