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Jewellery Chain
Jewellery chains, jewelry chains or body chains are metal chains that are used in jewellery to encircle parts of the body, namely the neck, wrists and ankles, and they also serve as points to hang decorative charms and pendants. Material Jewellery chains are typically made from precious metals, mainly gold and silver. Platinum, palladium and stainless steel, steel may also be used. These metals are used because they are not very reactive, keep both their intricate shape and their strength, and require only minimal maintenance to keep their shine. Small lever mechanisms called clasps serve as fastenings to enable the chain to be undone and redone. History The earliest chain necklaces have been found in ancient Babylonia among jewellery dating back to 2500 BC. The tomb of Puabi, Queen Puabi, who was buried in 2600 BC, included several gold chains that she wore in different ways. The old Greek, Roman and Egyptian civilisations followed later. An intricate 4th or 5th century Roman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Chain With Gemstones And Enamel, Late 16th Century, The Royal Armoury, Sweden
Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals. It is one of the least reactivity (chemistry), reactive chemical elements, being the second-lowest in the reactivity series. It is solid under standard temperature and pressure, standard conditions. Gold often occurs in free elemental (native state (metallurgy), native state), as gold nugget, nuggets or grains, in rock (geology), rocks, vein (geology), veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garnet
Garnets () are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. Garnet minerals, while sharing similar physical and crystallographic properties, exhibit a wide range of chemical compositions, defining distinct species. These species fall into two primary solid solution series: the pyralspite series (pyrope, almandine, spessartine), with the general formula [Mg,Fe,Mn]3Al2(SiO4)3; and the ugrandite series (uvarovite, grossular, andradite), with the general formula Ca3[Cr,Al,Fe]2(SiO4)3. Notable varieties of grossular include Grossular#Hessonite, hessonite and tsavorite. Etymology The word ''garnet'' comes from the 14th-century Middle English word ''gernet'', meaning 'dark red'. It is borrowed from Old French ''grenate'' from Latin language, Latin ''granatus,'' from ''granum'' ('grain, seed'). This is possibly a reference to ''mela granatum'' or even ''pomum granatum'' ('pomegranate', ''Punica granatum''), a plant whose fruits conta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Facet
Facets () are flat faces on geometric shapes. The organization of naturally occurring facets was key to early developments in crystallography, since they reflect the underlying symmetry of the crystal structure. Gemstones commonly have facets cut into them in order to improve their appearance by allowing them to reflect light. The earliest diamond cutting techniques were simply to polish the natural shape of rough diamonds, often octahedral crystals. It wasn't until the 14th century that faceting, the process of cutting and polishing a gemstone to create multiple flat surfaces or facets, was first developed in Europe. Facet arrangements Of the hundreds of facet arrangements that have been used, the most famous is probably the round brilliant cut, used for diamond and many colored gemstones. This first early version of what would become the modern Brilliant Cut is said to have been devised by an Italian named Peruzzi, sometime in the late 17th century.Gems, 5th edition, Webster ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grinding (abrasive Cutting)
Grinding is a type of abrasive machining process which uses a grinding wheel as cutting tool. A wide variety of machines are used for grinding, best classified as portable or stationary: * Portable power tools such as angle grinders, die grinders and cut-off saws * Stationary power tools such as bench grinders and cut-off saws * Stationary hydro- or hand-powered sharpening stones Milling practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; yet in mass production contexts, it can also rough out large volumes of metal quite rapidly. It is usually better suited to the machining of very hard materials than is "regular" machining (that is, cutting larger chips with cutting tools such as tool bits or milling cutters), and until recent decades it was the only practical way to machine such materials as hardened steels. Compared to "regular" machining, it is usually better suited to taking very ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anchor
An anchor is a device, normally made of metal, used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ', which itself comes from the Greek (). Anchors can either be temporary or permanent. Permanent anchors are used in the creation of a mooring, and are rarely moved; a specialist service is normally needed to move or maintain them. Vessels carry one or more temporary anchors, which may be of different designs and weights. A sea anchor is a drag device, not in contact with the seabed, used to minimize drift of a vessel relative to the water. A drogue is a drag device used to slow or help steer a vessel running before a storm in a following or overtaking sea, or when crossing a bar in a breaking sea. Anchoring Anchors achieve holding power either by "hooking" into the seabed, or weight, or a combination of the two. The weight of the anchor chain can be more than that of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Anchor Chain 2
Silver is a chemical element; it has symbol Ag () and atomic number 47. A soft, whitish-gray, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Silver is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Other than in currency and as an investment medium (coins and bullion), silver is used in solar panels, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belly Chain
A belly chain or waist chain is the popular English term for the Indian jewelry called ''kamarbandh''. The belly chain is a type of body jewelry worn around the waist. Some belly chains attach to a navel piercing; these are also called "pierced belly chains". They are often made of silver or gold. Sometimes a thread is used around the waist instead of a chain. The chain may be delicate and thin, or heavy and thick. Belly chains are considered auspicious for women in Indian culture. History The use of waist chains can be traced back to 4000 years or more originating in the Indian Subcontinent. Historically, waist chains have been used in India, by men and women, as ornaments and as part of religious ceremonies, as accessories and to show affluence. Many ancient sculptures and paintings from locations in India, dating back to the Indus Valley civilization, indicate that waist chains were a very popular jewelry. Many deities in the Hinduism, such as Lord Krishna, wore waist chain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anklet
An anklet, also called ''ankle chain'', ''ankle bracelet'' or ''ankle string'', is an ornament worn around the ankle. Barefoot anklets and toe rings historically have been worn for at least over 8,000 years by girls and women in Indus Valley, in Indian Subcontinent where it is commonly known as ''pattilu'', ''payal, golusu'' and sometimes as ''nupur''. They have also been worn by Egyptian women since predynastic times. In the United States both casual and more formal anklets became fashionable from the 1930s to the late–20th century. While in Western popular culture both younger men and women may wear casual leather anklets, they are popular among barefoot women. Formal anklets (of silver, gold, or beads) are used by some women as fashion jewellery. Anklets are an important piece of jewellery in Indian marriages, worn along with saris. Occasionally, anklets on both ankles are joined by a chain to limit the step. This practice was once prevalent in Southeast Asia, where th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bracelet
A bracelet is an article of jewellery that is worn around the wrist. Bracelets may serve different uses, such as being worn as an ornament. When worn as ornaments, bracelets may have a supportive function to hold other items of decoration, such as charms. Medical and identity information can be marked on some bracelets, such as allergy bracelets, hospital patient-identification tags, and bracelet tags for newborn babies. Bracelets may be worn to signify a certain phenomenon, such as breast cancer awareness, for religious/cultural purposes or as a sign of LGBTQ pride. If a bracelet is a single, inflexible loop, it is often called a '' bangle''. When it is worn around the ankle it is called an ''ankle bracelet'' or '' anklet''. A ''boot bracelet'' is used to decorate boots. Bracelets can be manufactured from metal, leather, cloth, plastic, bead or other materials, and jewellery bracelets sometimes contain jewels, rocks, wood, shells, crystals, metal, or plastic hoops, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Necklace
A necklace is an article of jewellery that is worn around the neck. Necklaces may have been one of the earliest types of adornment worn by humans. They often serve ceremonial, religious, magical, or funerary purposes and are also used as symbols of wealth and status, given that they are commonly made of precious metals and stones. The main component of a necklace is the band, chain, or cord that wraps around the neck. These are most often rendered in precious metals such as gold, silver, and platinum. Necklaces often have additional attachments suspended or inset into the necklace itself. These attachments typically include pendants, lockets, amulets, crosses, and precious and semiprecious materials such as diamond, pearls, rubies, emeralds, garnets, and sapphires. They are made with many different type of materials and are used for many things and sometimes classified as clothing. Historical necklaces Prehistoric neckware Prehistoric peoples often used natural ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Livery Collar
A livery collar or chain of office is a collar (jewelry), collar or heavy Link chain, chain, usually of gold, worn as insignia of office or a mark of fealty or other association in Europe from the Middle Ages onwards. One of the oldest and best-known livery collars is the #Collar of Esses, Collar of Esses, which has been in continuous use in England since the 14th century. History Origins Various forms of livery were used in the Middle Ages to denote attachment to a great person by friends, servants, and political supporters. The collar, usually of precious metal, was the grandest form of these, usually given by the person the livery denoted to his closest or most important associates, but should not, in the early period, be seen as separate from the wider phenomenon of livery badges, clothes and other forms. From the collar hung a heraldic badge, badge or device indicating the person the livery related to; the most important part of the ensemble for contemporaries. Equally gold ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
