Ouvarovite

Ouvarovite: See uvarovite.
Oval Cut: A "fancy cut" diamond or stone in an elliptical shape like an oval.
Overlay: The upper layer of an overlay technique. The layer with the design.

Some Other Varieties are Andradite, Essonite, Tsavorite, Spessartite, Melanite, Allochroite, Ouvarovite and Demantoid. This stone has a long history of use as a medicine stone and was used for healing blood and lung diseases.
Iolite ...

Named varieties of Garnet include Andradite, Tsavorite, Grossularite, Essonite, Pyrope, Almandine, Spessartite, Melanite, Allochroite, Ouvarovite, Demantoid, and Rhodolite.
Gaspetite ...

Garnet Stones are available in varieties named Grossularite, Pyrope, Almandine, Rhodalite, Andradite, Essonite, Tsavorite, Spessartite, Melanite, Allochroite, Ouvarovite and Demantoid.

These precious gemstones were name after the seeds of a pomegranate. Some variations of garnets include Allochroite, Almadine, Andradite, Demantoid, Essonite, Grossularite, Melanite, Ouvarovite, Pyrope, Rodalite, Spessartite, and Tsavorite.

See also: Jewelry, Silver, Diamond, Metal, Gemstone