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Reference No. : Weight : R-201918731 1065 Click to Download File

Discover the Tanzanite natural gemstone colour description, provenance and science behind. TANZANITE Tanzanite is a rare and beautiful gemstone that is prized for its unique blue-violet colour. It is a member of the zoisite mineral family and is found exclusively in the Merelani Hills of Tanzania, making it one of the world's most sought-after gemstones. Heritage Tanzanite was first discovered in 1967 by a Masai tribesman named Manuel de Souza who was searching for sapphires. The discovery of the gemstone caused a sensation in the jewelry world, and it quickly became popular among collectors and enthusiasts. Tanzanite was named after its country of origin, Tanzania. Physical Properties Tanzanite is a relatively soft gemstone with a hardness of 6.5 to 7 on the Mohs scale. It has a specific gravity of 3.35 to 3.55 and is typically found in small sizes. Tanzanite is also pleochroic, meaning it displays different colours when viewed from different angles. Colour Tanzanite is renowned for its unique blue-violet colour, which is caused by the presence of vanadium in the crystal structure. The gemstone can range in colour from light blue to deep violet, with the most valuable stones exhibiting a deep, rich blue hue. Treatments Tanzanite is almost always heat-treated to enhance its colour. Heat treatment can improve the gemstone's colour by removing the brownish or yellowish tints that are often present in natural tanzanite. Less common but still possible is the presence of filler such as oil and/or resin to improve the gemstone's clarity. Geographic Origin Tanzanite is found exclusively in the Merelani Hills of Tanzania, making it one of the rarest gemstones in the world. The mining of tanzanite is tightly controlled by the Tanzanian government, and the supply of high-quality stones is limited. Synthetic Synthetic tanzanite is not produced, and if existing today it remain in the realm of research. However, it may be possible to pass off other blue gemstones as tanzanite's imitation, such as glass. Others In addition to its beauty, tanzanite is said to possess metaphysical properties. It is believed to promote spiritual awareness and balance, and is associated with the throat and third-eye chakras. Tanzanite is also the birthstone for the month of December, and is sometimes given as a gift for 24th wedding anniversaries. Back to the Gem Encyclopedia

Discover the Emerald natural gemstone colour description, provenance and science behind. EMERALD Emerald is a gemstone variety of the mineral beryl, with a vivid green colour caused by the presence of chromium and sometimes vanadium. It is a popular gemstone and is often used in jewelry, particularly in engagement rings. Emeralds are also the traditional birthstone for the month of May. Heritage Emeralds have been prized throughout history, with ancient civilizations such as the Incas, Aztecs, and Egyptians all valuing the gemstone. The Egyptians believed that the green colour represented fertility and rebirth, and Cleopatra was known to have a great love for emeralds. In medieval Europe, emeralds were thought to have healing powers and were used to treat various ailments. Physical Properties Emeralds have a hardness of 7.5 to 8 on the Mohs scale, making them quite durable. They have a specific gravity of 2.7 to 2.8 and a refractive index of 1.57 to 1.58. They also have a vitreous to greasy luster and are typically transparent to translucent. Colour Emeralds are known for their intense green colour, which can range from a bluish-green to a yellowish-green. The colour is caused by the presence of chromium and sometimes vanadium in the crystal structure of the beryl mineral. The most valuable emeralds are those with a vivid to deep, rich green colour that is evenly distributed throughout the gemstone. Treatments Emeralds are almost always treated with oils or resins to improve their clarity and to fill any surface-reaching fractures or cavities, which is a common occurrence in natural emeralds. The use of oils and resins is considered an accepted industry practice, but it is important to be disclosed. Heat treatment and dyed is extremely rarely used to enhance the colour of low-quality emeralds, but this practice is possible. Geographic Origin The most famous emeralds come from Colombia, where they have been mined for millenia. Other significant sources of emeralds include Brazil, Zambia, and Zimbabwe, Afghanistan, Pakistan, Madagascar, and Russia. Synthetic Synthetic Emeralds are man-made emerald that are produced in a laboratory setting using advanced technological processes. It can be produced synthetically through a process known as flux growth or hydrothermal synthesis. These synthetic emeralds have the same physical and chemical properties as natural emeralds. Others Emeralds are primarily used in jewelry, particularly in engagement rings and other high-end pieces. They are also used in decorative objects and as a symbol of wealth and luxury. In addition to their use in jewelry, emeralds have also been used for their supposed healing properties and are believed to promote good health, well-being, and success. Back to the Gem Encyclopedia

Reference No. : Weight : R-201921009 5837 Click to Download File

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Bellerophon Gemlab testing prices for all our services related to gemology, including shipping prices to our laboratories. Mandatory insurance All gemstone submitted in our laboratories must have an insurance. You may waive our third party insurance if you are already insured. Insurance value is the total value per consignment. All risk insurance. This insurance does not include transportation and is valid 2 weeks maximum within Bellerophon Gemlab laboratories. It cover loss, theft an d damage. Important note: The insurance does not cover possible change of colour from fading tests. Total value <100 USD ---> 0 USD premium Total value <100,000 USD ---> 30 USD premium Total value >100,000 USD ---> 0.03% premium Testing prices Our testing prices are per service and not related to the weight of the item. All prices are given in the local currency of the laboratory per stone. Please note that our prices are linked to our service and not to the weight of the gemstone, as the work we do remains the same. VAT charges may apply. Prices may be subject to change. Testing prices Paris Testing prices Bangkok Testing prices Colombo Testing prices Paris French Become a Bellerophon Member You can become a Bellerophon Gemlab Member by pre purchasing a number of gemmological services in advance for the year. Bellerophon Gemlab Members receive special discounted prices. To become a member you must pre-purchase 100 discounted gemmological reports in the laboratory of your choice. Important note: your report will only be usable in the location selected. Your reports must be used within one year of purchase. Contact us Shipping prices to Paris laboratory Always inform us by email before shipping any stone to us. Contact your closest Bellerophon laboratory for any help regarding shipping. Below are some options and pricing regarding shipping to Bellerophon Gemlab Paris 16 Place Vendome: Small value from France only Declared value by French post office. Maximum insurance value 5,000 euros. Cost ~ 30 euros. From anywhere. Malca Amit by Fedex. Maximum insurance value 100,000 euros. Cost from 50 to 350 euros. From anywhere. Ferrari Group. Maximum insurance value 15,000,000 euros. Contact them for a detailed quotation. Malca Amit by Fedex Prices Contact Ferrari See more shipping options

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Reference No. : Weight : R-201917364 397 Click to Download File