Semi Precious :: Casa Gems :: - A Leading Exporter Of Semi Precious And Precious Gems Stones From India.

With wide collection of finest Semi Precious Stones like Blue Topaz, Lemon Topaz, Tourmaline, Smokey Topaz Etc. With All Shapes . We have resources, facilities and versatility to respond to the needs of any customer - from the end-user to the bulk buyer.

Blue Topaz's Physical Properties

Hardness: 8 .
Specific Gravity: 3.4 -3.6.
Refractive Index: 1.610 - 1.638 .
Chemical Composition: 014
Crystal Structure: Luster Vitreous.

Blue topaz is rare in nature, but easily created from clear material by irradiation.Pale topaz which is enhanced to become blue is found in Brazil, Sri Lanka, Nigeria, and China. There is an abundance on the world market, and very large, flawless stones are easily available. It is relatively low in value, about the same as good amethyst.. It is available in shades of blue from very light, through sky-blue, and on to almost an inky blue. Overtones of gray are not desirable, and further reduce its value

Topaz is a very hard gemstone but it can be split with a single blow, a trait it shares with diamond. As a result it should be protected from hard knocks.

(In its natural state blue topaz is a light green-blue (more blue than aquamarine).

Amethyst

Amethyst's Physical Properties

Hardness:7.
Birefringence:0.009.
Refractive Index: 1.544 - 1.553.
Variety of Quartz: SiO2 .
Crystal Structure: trigonal.
Color : various shades of purple.
Cleavage : none.

The name of amethyst came from the Greek amethystos, which means "sober". It is believed that amethyst brings happiness, strengthens will-power and improves the metabolism.

Amethyst ranges in color from pale lilac to deep purple. The deep colors are the most valuable, particularly a rich purple with rose flashes.

Amethyst is available with us in a wide range of calibrated sizes and shapes, including many fancy shapes.

Birthstone for: January

The name of garnets came from the Latin Granatus, this was how the seeds of the pomegranate were called. It was believed throughout the ages that garnets bring luck in love and friendship, and keep the enemies away from their owners.

Red remains the major colour for Garnets but today it can easily adapt to different shades of green, pale to bright yellow, fiery orange and fine earth- and umbra-shades.

BIRTHSTONE FOR: August

The gemstone is actually known under three names: Peridot, Chrysolith (derived from the Greek word “goldstone”) and Olivin, because Peridot is the gemstone variety of the Olivin mineral. In our trade it is generally called Peridot, a name derived from the Greek “peridona”, meaning something like “giving plenty”.

Peridot is one of the few gemstones which exist only in one colour. Peridot is not especially hard. Peridot is cut according to its crystal structure, usually in classical table and facetted cuts, round, antique, octagonal or oval shaped. Smaller crystals are cut as calibrated stones, larger ones are shaped by gemstone designers to fancy unique specimen stones.

The name comes from the Latin citrus – of "lemon-yellow" color. Citrine is a kind of quartz. Its color palette has all shades of yellow. Citrine includes yellow to gold to orange brown shades of transparent quartz. Sunny and affordable, citrine can brighten almost any jewelry style, blending especially well with the yellow gleam of polished gold.

Citrine is generally more inexpensive than amethyst and is also available with us in a wide range of calibrated sizes and shapes, including very large sizes. Citrine jewelry, as well as amethyst jewelry, should be kept away from prolonged exposure to strong light or heat. With this precaution, citrine jewelry will last for many generations.