Sky blue topaz is light blue topaz and it's very popular for sterling silver jewelry making. Here are information of sky blue topaz stone:

Chemical Composition: Al2SiO4(F,OH)2 (aluminum, hydroxyl-flourine silicate)

Shape: Round, Oval, Pear, Square, Emerald, Marquise, Trillion, Heart, Baguette

Specific Gravity : 2.64 – 2.65

Refractive index: 1.610-1.630

Hardness : 8.0 Mohs scale. Topaz is a hard and durable gemstone, and will not dissolve in most chemical solvents

Origial : Brazil, Sri Lanka, Madagascar, Myanmar, Pakistan, Russia, Nigeria, China, Australia, Japan, Mexico, South Africa, Scotland, Tasmania,USA.

Formation: Topaz is a fairly common and inexpensive gemstone. It can be found in huge and flawless crystals, which can be faceted into giant gemstones. Topaz crystals occur in highly acidic igneous rocks, such as rhyolite, and in metamorphic rocks. It is also found as a constituent of pegmatite dykes and is often a by-product of mining for other gems such as beryl or metals like tungsten, columbium or lithium. Blue Topaz does occur in nature, but is rare and almost always light color.

Birthstone : Sky Blue Topaz is the traditional birthstone for December and fourth, nineteenth wedding anniversary.

UNUSUAL PROPERTIES: Sky Blue Topaz Stones will heighten your ability to communicate better, and to express yourself in a meaningful way, both when speaking and when writing. It is a helpful stone if you have been having difficulties with public speaking. It may also assist you to think better and to concentrate on the task undertaken. It will also help you to decide what type of employment you wish to be in, and has a vibration that allows you to make clearer and more specific decisions about the direction you wish to take your life. It is an excellent stone for writers, especially if you have writers block, as it may inspire creativity.

TREATMENT: Blue topaz, which is very rare in nature, can be made by irradiating and then heating clear topaz. Natural blue topaz is very light in color and irradiation produces blue topazes of darker hues. Treated blue topaz is available from very light, to sky-blue, to almost an inky dark blue. Sky Blue Topaz goes through a one week of treatment time and then released for purchasing.