A list of the types of ring, here are all the ones I can find and will update this post as more come along:

Wedding Ring  are the simplest form of ring that can be made. A flat wedding band basically consists of a strip of metal that is bent around into a loop and joined where the ends meet.

Solitaire rings are rings with a single large stone as a centrepiece, usually a diamond.

Eternity rings are rings with stones, usually diamonds, of the same cut and size, set in one row all around the ring. The stones are usually round or square, and the setting is usually either claws or a channel setting. When the stones do not continue around the entire ring, but stop halfway around the finger, it is called a half-eternity ring.

Trinity rings or Trilogy Rings are three rings to be worn at one time.

Cluster rings are rings with a group of stones in a cluster setting, forming the focal point of the ring. The cluster setting usually consists of one large stone (usually round or oval) in the center surrounded with several smaller stones.

Aqiq ring A carnelian or Agate ring worn by some Muslims, especially Shi’ah, in imitation of Muhammad and the twelve Imams.

Birthstone Ring set with the wearers birthstone

Championship ring A ring presented to members of winning teams in professional business leagues as well as college tournaments in North America.

Claddagh ring An Irish friendship ring. It is traditionally used to indicate the state of romantic availability.  This ring is symbolised by two hands clasping a heart.

Class ring Worn by students and alumni in commemoration of their graduation.

Cocktail ring: Large and showy ring with precious or semi precious stones which is mainly worn at parties and special occasions

Costume Jewellery ring: A ring made of none precious materials eg not made of gold, silver or platinum

Cross over ring The syle of ring popularised in the Art Deco era where the stone is set into a cross over setting.

Dress Ring or Dinner Ring An over sized ring, set with non-precious or semiprecious stones.

Eclarian ring A ring worn by gay men to represent their beliefs. This ring has a separate centre which rotates.

Engagement ring A traditional ring worn by a woman to indicate her engagement to be married.

Engineer’s Ring, Iron Ring A ring worn by engineers on the pinky finger of their working hand to remind them of their ethical obligations.

Eternity ring A ring symbolizing eternity with a partner.

Fashion Ring Made by well know designers or sold through big name chain stores

Finger armor ring Typically it spans from the base of the finger to just below the nail or middle of the second joint and includes a bending joint.

Friendship ring Friendship rings are used to symbolize a close relationship that has no romantic undertone.

Gimmal ring Ring made of 2 or 3 linking hoops, popular for betrothals in 16th and 17th century Europe

Iron ring Ring worn by Canadian engineers.

Magic ring A fictitious ornament that appears frequently in fantasy stories and fairy tales.

Mood ring A novelty ring which changes color in response to body temperature, using a thermochromic liquid crystal.

Mother’s ring A ring worn by a mother displaying the birthstone of each of her children, and sometimes including those of the mother and father.

Mourning ring A ring worn in memory of someone who has died.

Multi-Finger ring Two or more conjoined rings, designed to be worn across two, three, or four fingers; popularized by hip-hop culture.

Pinky ring A ring worn on the pinky finger.

Posie ring A ring with a short inscription on its outer surface.

Pre-engagement ring A small, inexpensive ring given to a partner, to promise not to court a rival.

Promise ring A ring worn to remind oneself of a promise one has made.

Purity ring A symbol of virginity in some religious cultures.

Puzzle ring Interlocking rings forming a single band; difficult to reassemble if removed from the finger.

Poison ring

or Pillbox ring A Ring consisting of a pillbox fitted into the ring, either for keeping medication or poison.

Regard ring A Victorian engagement ring with an implicit acrostic: Ruby, Emerald, Garnet, Amethyst, Ruby, Diamond, Sapphire.

Ring of O A ring inspired by the Story of O, Pauline Reage’s novel, in which the heroine, “The O” is presented with such a ring as a symbol of her submission.

Rosary ring A rosary ring is a ring worn around the finger with 10 indentations and a cross on the surface, representing one decade of a rosary. The rings are used to keep track of place in the prayer by rotating the ring on a finger and feeling the marks.

Signet ring An emblematic, often familial, ring, often bearing a coat of arms, fit for use to imprint a wax seal on documents etc.

Sovereign ring A typically large, gold ring, set with a gold sovereign as its decorative feature.

Thumb ring This largest of finger rings is worn on the thumb primarily for fashion, but is also worn as a symbol of will power or internal energy, sexuality, and other beliefs or attitudes.

Toe Ring Made to be worn on a toe – usually quite a plain band.

Watch ring A small analogue or digital watch to be worn around a finger.

Wedding ring A ring presented in many marriage ceremonies to signify marital commitment. Originally worn only by the woman, it is now common for both spouses to wear such a ring