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Filigree (also less commonly spelt filagree, and formerly written filigrann or filigrene) is a delicate kind of jewellery metalwork, usually of gold and silver, made with tiny beads or twisted threads, or both in combination, soldered together or to the surface of an object of the same metal and arranged in artistic motifs. It often suggests lace and remains popular in Indian and other Asian metalwork. It was popular as well in Italian and French metalwork from 1660 to the late 19th century. It should not be confused with ajoure jewellery work, the ajoure technique consisting of drilling holes in objects made of sheet metal.
The English word filigree is shortened from the earlier use of filigreen which derives from Latin "filum" meaning thread or wire and "granum" grain, in the sense of small bead. The Latin words gave filigrana in Italian which itself became filigrane in 17th-century French.
Though filigree has become a special branch of jewellery in modern times, it was historically part of the ordinary work of the jeweler. Indeed, all the jewelry of the Etruscans and Greeks (other than that intended for the grave, and therefore of an unsubstantial character) was made by soldering together and so building up the gold rather than by chiselling or engraving the material.
Ancient work 
The Egyptian jewelers employed wire, both to lay down on a background and to plait or otherwise arranged jour. But, with the exception of chains, it cannot be said that filigree work was much practiced by them. Their strength lay rather in their cloisonné work and their molded ornaments. Many examples, however, remain of round plaited gold chains of fine wire, such as those that are still made by the filigree workers of India, and known as trichinopoly chains. From some of these are hung smaller chains of finer wire with minute fishes and other pendants fastened to them.
In ornaments derived from Phoenician sites, such as Cyprus and Sardinia, patterns of gold wire are laid down with great delicacy on a gold ground, but the art was advanced to its highest perfection in the Greek and Etruscan filigree of the 6th to the 3rd centuries BC. A number of earrings and other personal ornaments found in central Italy are preserved in the Louvre and in the British Museum. Almost all of them are made of filigree work. Some earrings are in the form of flowers of geometric design, bordered by one or more rims each made up of minute volutes of gold wire, and this kind of ornament is varied by slight differences in the way of disposing the number or arrangement of the volutes. But the feathers and petals of modern Italian filigree are not seen in these ancient designs. Instances occur, but only rarely, in which filigree devices in wire are self-supporting and not applied to metal plates.
The museum of the Hermitage at Saint Petersburg contains an amazingly rich collection of Scythian jewelry from the tombs of the Crimea. Many bracelets and necklaces in that collection are made of twisted wire, some in as many as seven rows of plaiting, with clasps in the shape of heads of animals of beaten work. Others are strings of large beads of gold, decorated with volutes, knots and other patterns of wire soldered over the surfaces. In the British Museum a sceptre, probably that of a Greek priestess, is covered with plaited and netted gold wipe, finished with a sort of Corinthian capital and a boss of green glass.
It is probable that in India and various parts of central Asia filigree has been worked from the most remote period without any change in the designs. Whether the Asiatic jewellers were influenced by the Greeks who settled on that continent, or merely trained under traditions held in common with them, it is certain that the Indian filigree workers retain the same patterns as those of the ancient Greeks and work them in the same way, down to the present day. Wandering workmen are given so much gold, coined or rough, which is weighed, heated in a pan of charcoal, beaten into wire, and then worked in the courtyard or verandah of the employer's house according to the designs of the artist, who weighs the complete work on restoring it and is paid at a specified rate for his labour. Very fine grains or beads and spines of gold, scarcely thicker than coarse hair, projecting from plates of gold are methods of ornamentation still used.
Cuttack, of the eastern Indian state Odisha, features traditional filigree work. It known as tarakasi in the Oriya language and most filigree work revolves around images of deities. Due to lack of patronage and modern design ideas, it is a dying art. Also noted is silver filigree of Karimnagar in neighbouring Andhra Pradesh state.
Medieval Europe 
Passing to later times we may notice in many collections of medieval jewel work reliquaries, covers for Gospel books, etc., made either in Constantinople from the 6th to the 12th centuries, or in monasteries in Europe, in which studied and imitated Byzantine goldsmiths' work. These objects, besides being enriched with precious stones, polished, but not cut into facets, and with enamels, are often decorated with filigree. Large surfaces of gold are sometimes covered with scrolls of filigree soldered on; and corner pieces of the borders of book covers, or the panels of reliquaries, are frequently made up of complicated pieces of plaited work alternating with spaces encrusted with enamel. Byzantine filigree work occasionally has small stones set amongst the curves or knots. Examples of such decoration can be seen in the Victoria and Albert, and British Museums. Examples include the Cross of Lothair in Aachen.
In the north of Europe the Saxons, Britons and Celts were from an early period skillful in several kinds of goldsmiths' work. Admirable examples of filigree patterns laid down in wire on gold, from Anglo-Saxon tombs, may be seen in the British Museum notably a brooch from Dover, and a sword-hilt from Cumberland. The Staffordshire Hoard of Anglo-Saxon gold and silver (estimated 700 CE) discovered in a field in Staffordshire, England, on 5 July 2009 contains numerous examples of very fine filigree described by archaeologist Kevin Leahy as "incredible".
Irish filigree work of the Insular period is more thoughtful in design and more extremely varied in pattern. The Royal Irish Academy in Dublin contains a number of reliquaries and personal jewels, of which filigree is the general and most remarkable ornament. The Tara brooch has been copied and imitated, and the shape and decoration of it are well known. Instead of fine curls or volutes of gold thread, the Irish filigree is varied by numerous designs by which one thread can be traced through curious knots and complications, which, disposed over large surfaces, balance one another, but always with special varieties and arrangements difficult to trace with the eye. The long thread appears and disappears without breach of continuity, the two ends generally worked into the head and the tail of a serpent or a monster.
The reliquary containing the "Bell of Saint Patrick" is covered with knotted work in many varieties. A two-handled chalice, called the "Ardagh Chalice" found near Limerick in 1868, is ornamented with work of this kind of extraordinary fineness. Twelve plaques on a band round the body of the vase, plaques on each handle and round the foot of the vase have a series of different designs of characteristic patterns, in fine filigree wire work wrought on the front of the repoussé ground.
Much of the medieval jewel work all over Europe down to the 15th century, on reliquaries, crosses, croziers, and other ecclesiastical goldsmiths' work, is set off with bosses and borders of filigree. Filigree work in silver was practised by the Moors of Spain during the Middle Ages with great skill, and was introduced by them and established all over the Peninsula, whence it was carried to the Spanish colonies in America. The Spanish filigree work of the 17th and 18th centuries is of extraordinary complexity, and silver filigree jewelry of delicate and artistic design is still made in considerable quantities throughout the country.
The manufacture spread over the Balearic Islands, and among the populations that border the Mediterranean. It is still made all over Italy, and in Portugal, Malta, Macedonia, Albania, the Ionian Islands and many other parts of Greece. That of the Greeks is sometimes on a large scale, with several thicknesses of wires alternating with larger and smaller bosses and beads, sometimes set with turquoises, and mounted on convex plates, making rich ornamental headpieces, belts, and breast ornaments. Filigree silver buttons of wire-work and small bosses are worn by the peasants in most of the countries that produce this kind of jewelry.
Some very curious filigree work was brought to Great Britain from Abyssinia after the Battle of Magdala: armguards, slippers, cups, some of which are now in the Victoria and Albert Museum. They are made of thin plates of silver, over which the wirework is soldered. The filigree is subdivided by narrow borders of simple pattern, and the intervening spaces are made up of many patterns, some with grains set at intervals.
Methods of fabrication and Uses 
The art may be said to consist in curling, twisting and plaiting fine pliable threads of metal, and uniting them at their points of contact with each other, and with the ground, by means of flux such as borax, by the help of the blowpipe. When granulated motifs are desired, small beads are made traditionally by using precious metal wire or fine sheet to start with, which is cut up in small pieces mixed with flux and placed in the small holes of a pitted block of charcoal (or any other suitable refractory material) and are then melted with a blowpipe (or today with a blowtorch), after which the bits of wire curl up and take a natural spherical like shape to end up in minuscule grains which slightly differ one from the other. Small grains or beads of the same metals are often set in the eyes of volutes, on the junctions, or at intervals at which they will set off the wirework effectively. The more delicate work is generally protected by framework of stouter wire.
Brooches, crosses, earrings, buttons and other personal ornaments of modern filigree are generally surrounded and subdivided by bands of square or flat metal, giving consistency to the filling up, which would not otherwise keep its proper shape.
Filigree jewelry design, and its twisting and soldering techniques, have an application in other metal-work such as wrought iron hanging wall brackets and silertoned doors.
For examples of antique work the student should examine the gold ornament rooms of the British Museum, the Louvre and the collection in the Victoria and Albert Museum. The last contains a large and very varied assortment of modern Italian, Spanish, Greek and other jewelry made for the peasants of various countries. It also possesses interesting examples of 19th century work in granulated gold by Castellani and Giuliano. Celtic work is well represented in the museums in Dublin and London.
Granulated work 
A few words must be added as to the granulated work. Such decoration consists of minute beads, globules of gold, soldered to form patterns on a metal surface. Its use is rare in Egypt. It occurs in Cyprus at an early period, as for instance on a gold pendant in the British Museum from Enkomi in Cyprus (10th century BC). The pendant is in the form of a pomegranate, and has upon it a pattern of triangles, formed by more than 3,000 minute globules separately soldered on. It also occurs on ornaments of the 7th century BC from Camirus in Rhodes. But these globules are large, compared with those found on Etruscan jewelry. Fortunato Pio Castellani, who had made the antique jewelry of the Etruscans and Greeks his special study, with the intention of reproducing the ancient models, found it for a long time impossible to revive this particular process of delicate soldering. He overcame the difficulty at last, by the discovery of a traditional school of craftsmen at Sant'Angelo in Vado, by whose help his well-known reproductions were executed.
- Oxford Dictionaries entry for "filigree" http://oxforddictionaries.com/definition/english/filigree
- Online Etymology Dictionary http://www.etymonline.com/index.php?term=filigree
- Castellani, Alessandro (1861). A Memoir on the Jewellery of the Ancients. Jackson and Keeson.
- See the "Antiquites du Bosphore Cimmerien", by Gille, 1854; reissued by S. Reinach, 1892, which contains careful engravings of these objects.
- "Arts & Crafts : Wisps of silver". The Hindu. 2004-11-11. Retrieved 2013-02-07.
- Earl of Dunraven (1873). "On an Ancient Chalice and Brooches Lately Found at Ardagh, in the County of Limerick". The Transactions of the Royal Irish Academy (Royal Irish Academy). 24 (Antiquities): 433–455.
- examples in the Victoria and Albert Museum
- Maryon, Herbert (1971). "Filigree". Metalwork and Enameling (5 ed.). Dover Press. pp. 53–55.
- Higgins, Reynold Alleyne (1980). Greek and Roman Jewellery (2 ed.). University of California Press. p. 20. ISBN 9780520036017.
- *Elements of a German filigree button, made c. 1880 image from Victoria & Albert Museum jewelery collection
- de Morgan, J.; J. Legrain, G. Jéquier (1903). Fouilles à Dahchour en 1894-1895. Vienna, Austria: Adolphe Holzhausen.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.