Gablonz (Jablonec nad Nisou) is a city in the Czech Republic, in Bohemia,
that is a center of jewelry making. Before World War 2, Gablonz was a
center of high-quality glass-blowing, bead-making, and other costume-jewelry
A series of small vertical, diagonal or twisted grooves applied as a border
decoration on silverware.
Gagate (popularly known as jet) is fossilized coal. It is a hard, lustrous
black stone that was used in mourning jewelry during the Victorian era
(especially after Queen Victoria's husband died and she went into a long-lasting
mourning, affecting fashion). Jet is frequently cabochon cut. Gagate has
been mined near Whitby (on the Yorkshire coast of England) since prehistoric
times. It is also found in Spain. France, Germany, and Russia, but these
other sources are said to be inferior to the harder, more elastic Whitby
jet. Jet/gagate has a hardness of 2.5-4 (quite soft) and a specific gravity
of 1.30-1.35 (it is relatively lightweight). Jet leaves a brown streak.
When burnt with a red-hot needle, jet smells like coal Black glass and
plastics are often used to imitate jet (glass is much heavier and harder
than jet) - jet is warm to the touch.
Gahnospinel is a rare blue spinel stone that is high in zinc and magnesium.
It can only be distinguished from most spinel by its high specific gravity
and high refractive index. Gahnospinel has a hardness of 8, a specific
gravity of 3.97. Its chemical formula is (Mg, Zn)Al2O4.
A type of mounting with a pierced, openwork design resembling the gallery,
(rear platform), of an early sailing ship.
A jewelry style popular in the early 20th century made possible by the
introduction of the widespread use of platinum and characterized by lightness
and delicacy that employed motifs such as garlands, ribbon bows, swags,
Garné was a trademark of the Garne jewelry company, New York, New
York, USA, which produced average-quality costume jewelry. The Garne mark
was first used in June, 1945. The small Garne company made necklaces,
pins, bracelets, earrings, watch fobs, and chatelaines
A family of stones having many varieties differing in color and in their
constituents, but all are silicates with the same isometric crystallization
and conforming to the same general chemical formula. Garnet is a very
commonly found in gneiss and mica slate. The name is derived from its
resemblance in color and shape to the seeds of the pomegranate. The most
common color of garnets range from light red to violet or plum-red, but
can also be white, green, yellow, brown, and black varieties. It seems
as though every shade and color of garnet is given its own name. Known
varieties of garnet include Andradite, Tsavorite, Grossularite, Essonite,
Pyrope, Almandine, Spessartite, Melanite, Allochroite, Ouvarovite, Demantoid,
and Rhodalite. (See individual listings). Garnets have a hardness that
varies between 6-8 on the Mohs scale. It was believed that the wearer
of garnets was kept in good health and protected while traveling. Garnets
are worn to signify truth and faith. Red garnet is the birthstone for
Gaspeite is a pale green to apple-green semi-precious gemstone that often
has brown inclusions of its host rock. Gaspeite is translucent to opaque.
This beautiful stone has only recently been used in jewelry, and is often
set in silver. Gaspeite has a hardness of 4.5 - 5, and a specific gravity
of 3.7. Gaspeite is Nickel Magnesium Iron Carbonate; its chemical formula
is (Ni, Mg, Fe)CO3. This stone is found in Gaspe Peninsula, Quebec, Canada
(where it was originally found and from which it derives its name) and
Kambalda and Widgie Mooltha, Western Australia, Australia
A precious or semiprecious stone that may be used as a jewel when cut
and polished. Include diamond, beryl, emerald, chalcedony, agate, onyx,
tourmaline, chrysolite, sapphire, ruby, spinel, topaz, turquoise, zircon,
cubic zirconia, jacinth, hyacinth, carbuncle, amethyst, alexandrite, cat's
eye, bloodstone, hematite, jasper, moonstone, sunstone, and many others.
Several organic materials like coral and pearls are also considered gemstones.
Today, the common definition of a gemstone is any precious or semi-precious
stone, rock or mineral.
The explicit definition of a gemstone is a precious stone: diamond, ruby,
sapphire, emerald and precious opal.
Semiprecious stones are any other rocks, minerals, or petrified material
that is not classified as precious and which is used in jewelry or collected.
Some semi-precious stones include: agate, topaz, carnelian, and jasper,
lapis lazuli, jade and turquoise.
Unless the word "genuine" is included in the description of
a piece of jewelry, it could simply be using the term to describe the
color of the piece rather than its actual content. For example, "gold"
meaning gold toned, rather than actual gold. (See below) Or "amethyst"
meaning amethyst colored, rather than containing an actual amethyst stone.
A smooth, round growth used as a gem, a "genuine" pearl is one
that formed naturally within the shell of a mollusk due to an irritant
rather than having the irritant placed into the mollusk by hand or being
made out of plastic.
A geode is a rock whose crystal-filled interior can be hollow or filled.
The crystals that form within the mineral crust of the geode is called
druze. From the outside, geodes look like rounded, but otherwise ordinary
German silver (also know as nickel silver) is an alloy consisting of mostly
copper (roughly 60 percent), and approximately 20 percent nickel, about
20 percent zinc, and sometimes about 5 percent tin (then the alloy is
called alpaca). There is no silver at all in German silver. This alloy
was invented around 1860 in Germany as a silver substitute.
Gerry's is a mark of Gerry's Creations, Inc., a costume jewelry company.
Gerry's produced medium-quality to inexpensive jewelry, including figural
pins (often depicting cute animals).
GIA stands for the Gemological Institute of America.
An object decorated with a thin layer of gold, gold leaf or gold foil.
A gimmel ring is a double ring that was designed during the Renaissance.
It consists of two or more interlocking rings. A gimmel ring symbolizes
the union of two people.
The gipsy setting is a recessed setting in which the stone is sunk into
the metal. There are often engraved designs around the stone (especially
star patterns). This type of setting was developed in the late 1800's
and was often used for rings. The gipsy setting is also known as the "star
A style of earring or brooch in which a large stone or decorative element
suspends three smaller pear-shaped pendants of similar design.
Girasol (which means sunflower in Spanish) is a yellow or orange type
of precious opal. Girasol is also known as hyacinth opal. In girasol,
the play of colors seems to come from within the stone, like a floating
light, and seems to follow the light source.
The outermost edge of a cut gem when viewed from the side and top. It
is the edge formed by where the top section (crown) and the bottom section
(pavilion) of the cut stone meet.
Givré beads are beads made of transparent glass fused around a
translucent core. Givré means frost in French.
Glass is often used in jewelry, as beads (faceted or spherical), rhinestones
and as poured glass.
Glass paste (also known as pate de verre) is glass that is ground into
a paste, put into a mold, and then melted. The final piece is an opaque,
dense glass with a frosted surface.
A glove ring is a clip-like device that is used to attach one's gloves
to a purse (or other object). The glove ring has a clip on one end (for
the gloves) and a chain with a clasp on the other end (to attach the device
to a purse handle).
(Also called "Beryllium") A rare silver-white metallic element
resembling magnesium. It is only found in nature combined with other elements,
usually silica or alumina, in the minerals phenacite, chrysoberyl, beryl,
euclase, and danalite.
Glyptography is the art of engraving gemstones, making intaglio and cameos.
Stones are engraved using grindstones with powdered emory or diamond as
A form of granite, but having the component materials, especially the
mica, arranged in planes so that it breaks rather easily into coarse slabs
A yellow precious metal which is valued for its beauty and purity since
it does not oxidize or tarnish like most other metals. It has been used
for coins and jewelry for over 6000 years and from this has become regarded
as a symbol of wealth. Gold is very ductile and is the most malleable
of all metals. It can be cast into huge statues or beaten into wafer thin
sheets of gold leaf. This malleability makes it too soft to be used in
jewelry without being alloyed with other metals. (See Karat).
Gold doré (pronounced gold doh-ray) is a bar of semi-purified gold
(e.g. bullion). After being mined, the first stage in the purification
process of the gold ore produces a cast bar (gold dore) that is approximately
90% gold. The other 10% is mostly metals like silver and copper.
Process by which sheets of gold of at least 10 karats and no less than
seven-millionths of an inch thick are electro-chemically bonded to another
Goldette is the mark of the Circle Jewelry Products Company, New York,
New York, USA (owned by David Gartner). The Goldette mark has been used
since October, 1958. Goldette made good quality jewelry often based on
Victorian styles, featuring gold-tone metalwork, intaglio, and/or enamelwork.
(Also "Goldfilled", or "gold-filled", abbreviated
g.f.) A piece of jewelry with a layer of gold mechanically applied to
the surface of a base metal, (like brass or copper), can be called Gold
Filled if the amount of gold equals one-twentieth of the total weight
of the piece. Victorian pieces are likely to be unmarked, but later pieces
are marked with the fineness of the gold layer, and the part by weight
of the gold. For example a piece marked "1/10 12K G.F." is composed
of at least 1/10 12K gold based on the weight of the finished piece. An
older unmarked gold piece may often be identified by wear through to base
metal, especially when viewing corners or edges under magnification. Look
for a change to a darker, brassy colored material at these spots.
Gold-plated metal has a very thin layer of gold on the surface, usually
applied by the process of electroplating. Pieces that are gold plated
are often marked G.E.P., gold electroplate, gold plated, or electro-plaqué
Goldstone (also known as aventurine) is a shimmering quartz stone that
ranges in color from yellow to red to light green to light brown. The
shimmer is caused by tiny metallic particles (mica) within the stone (not
Jewelry finished with a gold color with almost no appreciable measurement
of weight in actual gold.
Products that have an extremely thin layer of gold, (less than .175 microns
thick), applied by either dipping or burnishing the metal, but not plated..
This will wear away more quickly than pieces that are gold plated, gold-filled,
or gold electroplated.
Jewelry finished so that it has the look of gold, but no actual gold content.
Stainless steel that has been electro-charged to resemble real yellow
A piece of jewelry in Good Condition will show substantial evidence of
wear. It will have a noticeable patina which may include numerous very
fine pits or lines. It will not have cracks, chips, obviously discolored
or poorly replaced stones, evidence of glue or other repairs, or other
evidence of hard wear considered to be damage. Damage of any kind is separately
detailed in the item description, and generally items with damage appear
at very reduced prices in the Bargain section.
Goshenite is the pure, colorless form of beryl (Be3AlSiO6, related to
emerald and aquamarine). This hard, transparent gemstone is named for
the town of Goshen, Massachusetts, where it was first found. Goshenite
has been found in North and South America (especially Colombia), Northern
Europe, East Africa, South Africa, and the Himalayan mountains in Asia.
Goshenite has a hardness of 7.5 - 8.0 and a specific gravity of 2.6 -
2.8. It is not enhanced. Goshenite is sometimes coated with a green foil
to resemble an emerald.
Jewelry that evokes the feeling of medieval Europe in its use of styles,
symbols, and motifs. It began in the 18th century as part of the romantic
The weight, in grams, of a specific metal used in a piece of jewelry.
A graduated necklace of beads or pearls has beads that go from a small
size in the back of the neck and gradually increase in size to a maximum
in the front of the necklace.
A grain is a unit of weight used for diamonds and natural pearls. Four
grains are equal to one carat
A common igneous rock composed of quartz, orthoclase, and hornblende,
often accompanied by pyroxene or mica. It is called granite because of
the granular surface. Granite is frequently used for buildings and monuments.
A technique often used in Etruscan Revival jewelry, granulation is the
application of minute granules or grains of metal to the surface of a
piece of jewelry to form a decorative pattern.
Grape garnets are a rare, intense violet to purple-red garnet. Grape garnets
are made up of almandite and spessartite. They have a hardness of 7-7.5
and a specific gravity of 3.8 - 3.9. Grape garnets are found in the Orissa
district of northwestern India.
Used to describe a gemstone's luster. Some gems which exhibit a greasy
luster are: nephrite jade, jadeite, soapstone, and talc.
A design motif attributed to the ancient Greeks symbolizing the bonds
of love, friendship and devotion. Greek key designs are repeating patterns
of interlocking geometric shapes.
Green diamonds are rare, fancy diamonds and are quite valuable. Diamonds
are precious, lustrous gemstones made of highly-compressed carbon; they
are one of the hardest materials known. Diamonds have a hardness of 10,
a specific gravity of 3.5, and a refractive index of 2.417 - 2.419.
Green garnets are Demantoid garnets, a valuable green, and very lustrous
type of garnet. They are a rare variety of andradite. Demantoid garnets
have characteristic inclusions that look like horsetails. Demantoid garnets
has a hardness of 6-7 and a specific gravity of 3.8 - 3.9. Demantoids
were very popular in the 1800's, but are rarely used today.
An alloy made of gold mixed with copper, silver, zinc and often cadmium.
The copper is what gives it the greenish tinge. It is commonly used with
enameling to strengthen the color of the gold when set beside the bright
Green rouge is chromium dioxide, which is used to polish precious metals,
giving them a luster.
Greenstone is another name for nephrite, a semi-precious stone and a variety
of jade. Nephrite is slightly softer that jadeite and is often veined;
it is used in carvings, for making beautiful bowls and vases.
Grelots are small beads that have an elongated, pendant shape.
Grey gold is gold that has been alloyed with 15-20% iron.
Griqualandite is tiger's eye from Griqualand, South Africa. It is a yellowish-brown
to reddish-brown gemstone that has a silky luster. This gemstone has bands
of yellow and brown; when viewed from the opposite direction, the colors
are reversed. Tiger's eye is usually highly polished and set as a cabochon
(or cut as a bead) to display the stone's chatoyancy (light reflected
in thin bands within the stone). Tiger's eye is a type of chatoyant quartz
with fibrous inclusions (especially crocidolite). This stone is sometimes
heat-treated. Tiger's eye has a hardness of 7.0.
The channel routed in a line.
Grosse is a mark of the German jewelry company Henkel and Grosse. Located
in Pforzheim, Germany, this company has been in business since 1938. Grosse
has produced jewelry for Christian Dior since 1955. Grosse also produces
jewelry for Burberry's. Later marks of Grosse have an acute accent on
the final e, Grossé.
Resembling a gooseberry, as with a grossular garnet, also called Grossularite.
Grossular garnet is a type of garnet, calcium-aluminum silicate. Hessionite
is a transparent brown, yellow, orange, or honey-colored variety of grossular
garnet often used in jewelry. The yellow variety is called cinnamon stone,
hyacinth or jacinth. Transvaal "jade" is a type of green to
gray grossular garnet from South Africa. Pink grossular garnets varieties
include landerite, rosolite, andXalostocite. Tsavorite is an emerald-green
grossular garnet. Grossular garnet has a hardness of 6-7.5 and a specific
gravity of 3.6.
A translucent garnet of a pale green color like that of the gooseberry,
occurring alone or as a constituent of the common garnet. It may also
be pink, brown, or black.
A style of enameling in which a continuous decoration is engraved by an
engine-turned lathe and then covered with translucent enamel so that the
engraving can be seen through the enamel.
Gunmetal is a metal alloy that is composed of 90 percent copper and 10
Gutta percha is a resin from the Isonandra Gutta tree. Jewelry was made
from gutta percha in the mid-1800's. Gutta percha was also used to insulate
electrical cables. The Gutta percha company was founded by Dr. Montgomerie
in 1845 and was in business until 1930.
A soft, white mineral composed of hydrous sulfate of lime. It is used
as plaster of Paris.
A gypsy ring (also spelled gipsy) is a ring with a recessed stone or stones.
Also known as "star setting."
A setting in which the surface of the mount is virtually flush with the
top of the gemstone.