





he traditional classification in the West, which goes back to the Ancient Greeks, begins with a distinction between precious and semi-precious stones; similar distinctions are made in other cultures. In modern usage the precious stones are diamond, ruby, emerald and sapphire, with all other gemstones being semi-precious.[2] This distinction is unscientific and reflects the rarity of the respective stones in ancient times, as well as their quality: all are translucent with fine color in their purest forms, except for the colorless diamond, and very hard,[3] with hardnesses of 8-10 on the Mohs scale. Other stones are classified by their color, translucency and hardness. The traditional distinction does not necessarily reflect modern values, for example, while garnets are relatively inexpensive, a green garnet called Tsavorite, can be far more valuable than a mid-quality emerald.[4] Another unscientific term for semi-precious gemstones used in art history andarchaeology is hardstone. Use of the terms 'precious' and 'semi-precious' in a commercial context is, arguably, misleading in that it deceptively implies certain stones are intrinsically more valuable than others, which is not the case.
In modern times gemstones are identified by gemologists, who describe gems and their characteristics usingtechnical terminology specific to the field of gemology. The first characteristic a gemologist uses to identify a gemstone is its chemical composition. For example, diamonds are made of carbon (C) and rubies ofaluminium oxide (Al2O3). Next, many gems are crystals which are classified by their crystal system such ascubic or trigonal or monoclinic. Another term used is habit, the form the gem is usually found in. For example diamonds, which have a cubic crystal system, are often found as octahedrons.
Gemstones are classified into different groups, species, and varieties. For example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Emerald (green), aquamarine (blue), bixbite (red), goshenite (colorless), heliodor (yellow), andmorganite (pink) are all varieties of the mineral species beryl.
Gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture, and luster. They may exhibitpleochroism or double refraction. They may have luminescence and a distinctive absorption spectrum.
Material or flaws within a stone may be present as inclusions.





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These jewelry designs are crafted with the utmost care using the Lost Wax Casting Process, or "Cire Perdue", a process nearly four thousand years old. Lost Wax Casting has visually told the tale of past cultures, their religion and their social structures.
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Baselworld Watch and Jewellery Show is a trade show for the watch and jewelery industry organized annually in the city of Basel,Switzerland. The international show unites about 2,100 exhibitors from over 45 countries, including the leading watch and jewelry brands, as well as companies specializing in precious gems. The exhibitors display their latest products to the industry's experts, mass media representatives, watch collectors and connoisseurs, just everyone interested in the most recent industry novelties.
Visitors of the show get acquainted with an exclusive range of products. The exhibition area covers more than 160,000 m2 with different halls situated on several floors. Products are divided in specialized sectors placed in six exhibition halls - Hall of Universe, Hall of Elements, Hall of Visions, etc. The Baselworld management takes care of updating the halls' design. In 2007 the Hall of Dreams has been entirely redecorated.
Watch and jewellery companies, and other brands related to the industry exhibit their products in their own halls. Baselworld also comprises national pavilions. The show provides a thorough market overview and offers the participants a suitable business platform for discovering new opportunities and finding new partners. Baselworld traditionally takes place in spring. The show attracts over 94,000 visitors, with retailers and wholesalers from different parts of the world. Show visitors get surrounded by business and networking atmosphere and become aware of the latest industry trends and innovations.
Free shuttle services run from the Basel airport (SWISS exit) to the trade show, and the Basel SBB terminal has a tram service as well. If arriving at the airport ensure that you take the SWISS exit, and not the FRENCH exit.
Tickets are priced CHF 45.- for adults and CHF 30.- for students and can be purchased online to avoid queuing.
Discounted rail passes also exist offering a cheaper fare as well as an optional 'combo' pass which also admits the traveler to the show. The show is open daily from 9am to 6pm to the public, apart from the last day which ends at 4pm.
With all its romance and glamour, has been a source of perennial fascination. Tracing in scholarly detail, jewellery and the ethos in which it was used down the ages, beginning with Mohenjodaro, the book records the changes and the variety in materials used, fashions and the art and technology of jewellery-making. Illustrations in stunning colour are highly appealing.