SEDA JEWELERY

OPAL AND TANZANITE PENDANT

FACTORY DIRECT-NATURAL LOOK

This is a pendant with a natural  untreated crystal opal from Lightning ridge .There is also a  natural blue voilet Tanzanite which i bought when i was at the Arusha gem show in Tanzania which enhances the pendant.

 The workmanship and quality is excellent.

Sterling silver

Stamped 925

Weight of Tanzanite 1.05 cts app

Weight of stone and silver: 7.31 cts. 

Size of opal 6 x 3 mm app

Amount of silver used: 1.25 grams app

Length of pendant 18 mm app

"Ocean" Tanzanite is the name given to a lighter green type of Zoisite.

Many people believe - incorrectly - that if you heated these blue green stones they would become totally blue. The reality is that their natural green tint comes from a larger than usual amount of chemical chromium and very little vanadium ( the chemical responsible for Tanzanite's famous blue violet hues )  and heating wouldn't change a thing.

Tanzanite is an extraordinary gemstone. It occurs in only one place worldwide -Tanzair africa. Its blue, surrounded by a fine hint of purple, is a wonderful colour. It is also found in a varitey of colours uncluding green and the rare pink colour.Thanks to its unusual aura and the help of the New York jeweller's Tiffany, it has rapidly become one of the most coveted gemstones in the world.

Tanzanite is a blue variety of the gemstone zoisite. It consists of calcium aluminium silicate and is not particularly hard, having a value of 6.5 to 7 on the Mohs scale. For that reason, it should always be worn carefully and never placed in an ultrasonic bath for cleaning or brought into contact with acids.

The deep blue of the tanzanite is fantastic, and runs from ultramarine blue to light violet-blue. The most coveted colour is a blue surrounded by a delicate hint of purple, which has a particularly wonderful effect in sizes of over 10 carats. The well developed polychromaticity of the tanzanite is typical: depending on the angle from which you look at it, the stone may appear blue, purple or brownish-yellow. Having said that, most raw crystals are somewhat spoiled by a brownish-yellow component, though it can be made to disappear by the cutter if he heats the stone carefully in an oven to approximately 500°. During the procedure he must pay careful attention to the moment at which the colour turns to blue. This burning is a method of treatment which is regarded as customary in the trade, but the raw stones must be as free of inclusions as possible, since otherwise fissures may occur. In fact working with tanzanite can sometimes give even the most experienced cutter a bit of a headache, the cleavage of this gemstone being very pronounced in one direction. This exclusive gemstone is cut in every imaginable shape from the classical round shape to a number of imaginative designer cuts.