Emerald Gemstone Information
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About Emerald - History and Introduction
Emerald is the most precious stone in the beryl group. The name comes from the old French word 'esmeralde', which was derived from the Greek word 'smaragdos' meaning 'green stone'. By definition, emerald is any medium to dark green beryl colored by chromium. Green beryl colored only by vanadium is not considered to be true emerald, but rather as simply green beryl. Since the 1960s, the American jewelry industry changed the definition to include vanadium colored beryl as 'emerald', but in the UK and Europe, they are still not recognized as such. The historical green color of emerald is unparalleled in the world of gemstones and it is considered as one of the most 'precious four' of all gemstones, which also includes sapphire, ruby and diamond. Although emeralds are one of the most valuable gemstones available today, most are very heavily included, rendering their resistance to breakage as generally poor. According to GIA, emerald is a Type III clarity gemstone, which means that even good quality emerald used in fine jewelry today is in the I2 to I3 range.
Although Colombia is the most famous source for 'deep green' emeralds, emerald deposits are mined from many locations around the world. Recent decades have seen emerald production increase as a result of newly discovered deposits in South America, Africa and across Europe. Today, Brazil and Zambia are among the leading producers of fine emeralds, following Colombia. Brazilian emeralds are prized for their excellent clarity and slightly yellowish green color, while Zambian emeralds are desired for their slightly bluish green color, which is similar to that of Colombia's 'emerald-green' emeralds.
Identifying Emerald Back to Top
Almost all natural emeralds contain distinct characteristic inclusions and almost all are treated with oil or resin to fill tiny fissures and cracks. It is the presence of these flaws and oil which makes it quite easy to identify and distinguish natural emeralds amongst other similar gemstones. Artificial light will expose and amplify inclusions and fractures that prove the stone to be a natural emerald. Emerald color is owed to trace amounts of chromium and vanadium, and color is best admired under natural daylight. One of the easiest methods to identify green emeralds is to test for specific gravity (density) and hardness. Like all forms of beryl, emerald is harder than apatite, quartz and feldspar, but is slightly softer than spinel, topaz and sapphire. However, emerald is generally more fragile than other beryl, owing to its naturally included state.
Emerald Origin and Gemstone Sources Back to Top
Emerald mining is almost exclusively done from host rocks, where the emerald has grown into small veins or on walls of cavities.
Colombia is the international center of emerald mining. The Muzo Mine, northwest of Bogotá, produces fine-quality stones of a deep green color. The Chivor Mine, northeast of Bogotá, is another important deposit, and other locations promise additional successful mining results.
South African deposits are concentrated in the Northern Transvaal. But only five percent of the stones found in the Cobra and Somerset Mines are of good quality. Most stones are light or muddy and are only suitable for cabochon cuts.
Buying Emeralds and Determining Emerald Value Back to Top
Emerald Gemological Properties: Back to Top
Please refer to our Gemstone Glossary for details of gemology-related terms.
Emerald: Related or Similar Gemstones: Back to Top
Emerald belongs to the important group of beryl gemstones. There are quite a few different gemstone-quality varieties of beryl, most of which are classified based on color and coloring agents, such as pink morganite and red bixbite. There are also many other green colored gemstones that can be confused with green emerald, including green aventurine quartz, demantoid garnet, tsavorite, chrome tourmaline, chrome diopside, grossularite garnet, uvarovite garnet, verdelite, fluorite, hiddenite and peridot.
Emerald Mythology, Metaphysical and Crystal Healing Properties Back to Top
Innumerable fantastic stories have grown up around this magnificent gem. The Incas and Aztecs of South America, where the best emeralds are still found today, regarded the emerald as a holy gemstone. However, probably the oldest known finds were made near the Red Sea in Egypt. These gemstone mines, exploited by Egyptian pharaohs between 3000 and 1500 B.C. and later referred to as "Cleopatra's Mines", had already been exhausted by the time they were rediscovered in the early 19th century.
Written many centuries ago, the Vedas, the holy scriptures of the Hindus, say the following of the precious green gems and their healing properties: 'Emeralds promise good luck' and 'the emerald enhances the well-being'. No wonder the treasure chests of Indian maharajas and maharanis contained wonderful emeralds. Emerald is the official birthstone for May and the official anniversary gemstone for commemorating the 20th and 35th year of marriage.
The New York Museum of Natural History, for example, exhibits a cup made of pure emerald, which belonged to the Emperor Jehangir, next to the 'Patricia', one of the largest Colombian emerald crystals, which weighs 632 carats.
The collection of the Bank of Bogotá includes five valuable emerald crystals with weights of between 220 and 1796 carats.
Splendid emeralds form part of the Iranian National Jewelry Treasury, adorning, amongst other things, the majestic diadem of the former Empress Farah.
The Turkish sultans also loved emeralds. In Istanbul's Topkapi Palace there are exhibits of items of jewelry, writing implements and daggers, each lavishly adorned with emeralds and other gems.
The Viennese treasury contains a vase, 4.5 inches (12 cm) high, with a weight of 2205 carats, which was cut from a single emerald crystal.
Her Majesty, Queen Elizabeth II, has so much jewelry that she has a special room to keep it in, said to be about the size of an ice rink, and situated 40 feet beneath Buckingham Palace. This does not even include the British Crown Jewels, which are kept in the Tower of London. The Queen's personal jewelry is conservatively valued at $57 million and most of it was received as gifts. The fabulous gems in her collection include the "Cambridge and Delhi Dunbar Parure", a fantastic suite of emerald jewelry which includes an emerald diadem.
Elizabeth Taylor also had a well-known jewelry collection. As an engagement present, Richard Burton gave her an emerald and diamond brooch, which she wore with an emerald necklace he gave her as a wedding present. Earrings, a bracelet, and a ring followed.
Emerald Gemstone and Jewelry Design Ideas Back to Top
Green emeralds are excellent gemstones for most types of gemstone jewelry. They are considered to be fairly hard, although not so tough owing to the natural flaws of emeralds. They also have a good level of fire and brilliance which makes them ideal gemstones for open settings. Green emeralds are perfect for setting in large gemstone emerald rings and pendants. They are best set into designs that allow light to pass through easily in order to maximize transparency. The truncated corners of the 'emerald'-cut' were designed to help emeralds to be more 'wearable' as they reduce the risk of facet corners breaking and chipping. When wearing emeralds, emerald cuts, ovals and other shapes without pointed facet corners are the safest.
Emeralds are excellent gems for beaded and tumbled jewelry, such as strands and bracelets, but typically only lower grade emeralds are reserved for this type of jewelry use. Emeralds in general are one of the most popular gemstones in the world and they are a favorite among the elite, especially considering that they are one of the 'precious four' gems. Unlike many other rarer colored stones, emeralds are often available in local jewelry stores, usually as high-end designs. All emeralds are brittle, and due to their internal stress, extra care should be taken during setting, cutting and repolishing. Emeralds are sensitive to heat and pressure, so jewelers should be careful when setting them.
Note: Buy colored gemstones by size and not by carat weight. Colored stones vary in size-to-weight ratio. Some stones are larger and others are smaller than diamond by weight in comparison.
Emerald Gemstone and Jewelry Care and Cleaning Back to Top
Precious emerald is sensitive to pressure and vulnerable to household chemicals. Although emerald is one of the harder gemstones, it does still require careful handling, due to its naturally included and flawed formation. Extra care should be taken when handling emeralds as they are more fragile than other forms of beryl. Avoid wearing emerald jewelry when working with harsh chemicals or household cleaners, such as bleach or acid. When cleaning, you can use warm soapy water and a tissue or a soft cloth. Be sure to rinse the stones well to remove all soapy residue.
Avoid ultrasonic cleaners and steamers when cleaning your emeralds as these can remove the oils that are used to enhance the emeralds. Traditional oiling for emeralds is stable but not permanent, which means that most emeralds will need re-oiling every so often to return some of their lost color and luster. Always remove any emerald jewelry before exercising, cleaning, playing sports or engaging in vigorous physical activities. Emeralds can easily scratch other gems, and they can easily be scratched by harder gems such as topaz and sapphires. To prevent scratches, store emeralds away from other gemstones and gemstone jewelry. Store your gemstones by wrapping them in soft cloth and placing them in a fabric-lined box.
- First Published: September-02-2006
- Last Updated: November-08-2018
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