Saturday, September 20, 2008

An exquisite and rare lemon-yellow or green gemstone

Sphene (or Titanite) is a rare collector gemstone with an unusually high refractive index and a hardness of 5 -5.5. Sphene is named from the greek word for wedge, because of its typical wedge shaped crystal habit Because of its high dispersion and refractive index, a well cut sphene can display stunning brilliance. Sphene is somewhat soft and as a result more suitable as a pendant than as a ring stone.

Sphene is widely distributed as an accessory mineral, particularly in coarse-grained igneous rocks such as syenite, nepheline syenite, diorite and granodiorite. It occurs similarly in schists or gneisses and in some metamorphosed limestones. Collectors appreciate its crystals, in which twinning is common, as well as the striking appearance of the faceted gemstones.

Thursday, September 11, 2008

Amazing color and beautifully cut trillion sphene

Sphene is a fairly rare stone and is classed as collector's stone and this 16.27 ct stone from Madagascar is a brilliant gem, with a diamond like luster and fire.

Pictured gemstone is perfect for pendant and maybe for the designer ring, if you don't go out and chop wood with it on. Like tanzanite, sphene won't take rough wear.

If used for the pendant, where the light can react with it best anyway, you will have very unusual and rare piece of fine jewellery.