Lilly Dache is the mark of Lilly Dache, Inc., a company located in New
York and Paris. Lilly Dache produces high-quality hats, clothing, accessories,
perfume, and cosmetics. The Lily Dache mark was first used on costume
jewelry in 1923. Lilly Dache jewelry pieces are relatively rare and expensive.
Lilly Dache was born in France, and began her fashion career there as
a milliner (hat maker). She emigrated to New York, New York, USA, in 1924.
Dache is reported to have said, "Glamour is what makes a man ask
for your telephone number. But it also is what makes a woman ask for the
name of your dressmaker." Dache's books include Lilly Dache's Glamour
Book (published in 1956) and Talking through my hats (published in 1946).
Dalsheim and "White Jet" are marks on costume jewelry made by
Dalsheim Accessories, Inc. of New York, New York, USA. The company was
founded by Maurice Dalsheim. These relatively rare marks were first used
Damascening is the inlaying of a soft metal (like silver or copper) into
a hard metal (like steel). The name comes from the city of Damascus, where
this process was first used.
Danburite (Calcium borosilicate - CaB2Si2O8) is a clear to white silicate
mineral whose orthorhombic crystals are transparent to translucent (danburite
can also be yellow, greenish, or brown); it resemblestopaz. It was named
for the city of Danbury in Fairfield County, Connecticut, USA (where the
original specimens were found in 1839). Danburite is also found in Russell,
New York (USA), Charcas and San Luis Potosi (Mexico), Kyushu Island (Japan),
Madagascar, Siberia, Mogok (Myanmar), Bolivia, and Uri (Switzerland).
Danburite has a hardness of 7 - 7.3 and a specific gravity of 2.97 - 3.02.
Its streak is white.
Danecraft is a mark used on silver and vermeil (gold-plated silver) costume
jewelry produced by Felch and Company, which was founded by Victor Primavera
in 1938 in Providence, Rhode Island, USA. The company is now called Felch-Wehr
(since 1977) and still produces silver and vermeil jewelry. Before the
formation of Felch and Company, Victor and his brother Thomas had run
the Primavera Brothers Jewelry Company in the 1930's, until Thomas' death.
Primavera is a name now used by Danecraft for a line of its jewelry. Danecraft's
Wingback earrings (from the 1950's) were a major product of the company.
The piece above is a older Danecraft cat and dog pin.
Darya-i-Nur (meaning "Sea of Light") is one of the largest-known
diamonds. It is a flawless, transparent, pink diamond from India, weighing
about 175 to 195 carats. It was taken to Prrsia (now Iran) after Persia's
attack on Delhi, India, in l739. The Darya-i-Nur is in the crown jewels
of Iran, and was worn by the Shah of Iran.
Dead pawn is an item that was pawned but was never collected by the original
A "dead" stone is a foil-backed rhinestone that has lost its
original shininess, usually after water has damaged the foil. For example,
a "dead" clear rhinestone will appear dull and off-white, greenish
Dead soft is a term that refers to very soft-tempered metal. Dead soft
wire is the most easily bent wire. For example, copper electrical wire
is dead soft.
Jewelry made from Delft faience (tin-glazed earthenware) is usually set
in silver, often with delicate filigree work and granulation. The classic
hand-painted blue-on-white pottery often depicts windmills, flowers, and
Dutch landscapes. Delftware jewelry includes necklaces, pendants, earrings,
pins, bracelets, rings, charms, and cufflinks. Delft pottery has been
in production in Holland since the middle 1600s, but Delft jewelry dates
from much later. Delft blue is the most recognized Delft style, but other
colors and styles have been used in Delft pottery and jewelry.
De Lizza & Elster
The De Lizza & Elster (D & E) company manufactured costume jewelry,
buttons, and buckles; they sold wholesale to costume jewelry companies.
De Lizza & Elster made pieces for Weiss, Kramer, Kenneth J. Lane,
Hobe, Celebrity, Hattie Carnegie, Alice Caviness, Karu, and many others
(including department stores). D & E was founded in New York, New
York, by William De Lizza and Harold Elster around 1947. William De Lizza
was the main designer. The pieces they made were not marked (only a paper
hangtag indicated the brand). In 1967, D & E began making in-house
pieces that they called "Juliana" -- these pieces were designed
by Frank DeLizza (the co-founder William De Lizza's son) and were marked
by a paper hangtag. Although D & E went out of business in the late
1990s, Frank DeLizza is producing copies of many of his popular original
Demantoid garnets are valuable green, very lustrous garnets with a cubic
crystalline structure. They are a rare variety of andradite. Demantoid
garnets have characteristic inclusions that look like horsetails. Demantoid
garnets have 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.
A demilune (meaning "half moon") stone is shaped like a half
(or smaller) moon.
A demiparure is a matching set of jewelry, usually containing a necklace,
earrings, and a pin. See parure. The demi-parure above is a set by Trifari.
Dendritic means tree-like, having a branching pattern (like moss agate).
Denim lapis is a relatively pale, inexpensive variety of lapis lazuli
that is from Chile. It is the color of denim cloth due to calcite inclusions
(which whiten the stone and lower its value).
Dentelles (meaning "lace" in French) are rhinestones cut with
32 or 64 facets.
DeRosa was a mark of the Ralph DeRosa Company of New York, New York. DeRosa
produced very high-quality costume jewelry, including necklaces, earrings,
bracelets, pins and fur clips, made from 1934 until 1970. Pieces were
often made of Sterling silver, and had beautiful prong-set rhinestones,
faux pearls, and/or excellent enamelling work.
A diadem is a tiara, a circular or semi-circular piece of jewelry worn
on the head.
Diamanté is another word for rhinestone.
Diamonds are precious, lustrous gemstones made of highly-compressed carbon.
Diamonds 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.
Colors of diamonds range from colorless, yellow, orange, brown, to almost
black. Rarer colors are red, blue, green, and purple; these colors (called
fancies) are quite valuable. Canary diamonds have a deep yellow color.
A diamond's value is based on the "4 C's": color, cut, clarity,
and carat weight. A diamond's color (saturation) is rated on an alphabetical
scale ranging from D (white) to Y (yellow). "Z" diamonds are
fancy, or deep-colored diamond. A diamond's cut is designed to maximize
the stone's natural "fire"; brilliant cuts are preferred. A
diamond's clarity depends on the number and size of its flaws and inclusions
(of other minerals, like quartz). Clarity is rated from FI (flawless),
IF (flawless at 10x magnification), a series of V ratings (very small
flaws at 10x magnification), a series of S ratings (small flaws at 10x
magnification), to I1, I2, and I3 (having inclusions visible to the naked
eye). A diamond's carat weight is simple how much it weighs (a carat is
about 0.2 grams or about 0.007 ounces). The largest-known gem-quality
diamonds include the Cullinan (aka the Star of Africa, 530.20 carats),
the Excelsior, the Great Mogul (an ancient Indian diamond which is said
to have originally weighed 787.5 carats, but its location is not not known
and nothing about it has been authenticaed), the Darya-i-Nur, the Koh-i-Nur,
and the Hope diamond (named for a purchaser, Henry Thomas Hope).
Diapering is a crisscross pattern of diamond-shaped lines on a raised-dot
A glass which contains ultra-thin layers of aluminum, chromium, silicon,
zirconium or the metal alloy titanium. The colors are almost holographic
Addition of the various elements is what produces the bold and dramatic
colors. Colloidal gold may also be added. The appearance will be different
depending on whether the light is reflected or transmitted.
Dichroism is the property of having more than one color, especially when
viewed from different angles. Many minerals (like rubies and axinite)
are naturally dichroic. This effect can be artificially caused by a thin
layer of a metallic oxides that is deposited on the surface of a material.
Dichroic coated glass transmits some wavelengths of light and reflecting
others, giving it an opal-like appearance.
Die stamping (also known as machine-stamping) is a process in which sheet
metal is cut and shaped between two dies, forming a pattern in relief.
Two steel dies are used, the male die has the design in cameo (protruding);
the female die has the design hollowed out. The male die is put on top
of the metal, the female die is put on the underside of the metal. The
press is forcefully brought down onto the dies and metal, forcing the
metal into the shape of the mold. Many medallions and mass-produced jewelry
findings are made this way.
Diffusion is the process of color enhancing a stone by heating the stone
in the presence of iron oxide, chrome oxide or similar compounds. The
process colors the stone by infusing the outside surface of the stone
with color. Only applied to cut stones as any further cutting would remove
the color enhancement. This process is often used on sapphires and topaz
to heighten or alter the colors.
Diffusion treated stones are color-enhanced (not naturally colored) stones.
The diffusion process only colors the outer surface of the stone, so chipping
or repolishing will result in a loss of color. Diffusion-treated stones
are already-cut stones that are heated in the presence of other compounds
(like iron oxide, chromium oxide, titanium dioxide, etc.) that will infuse
the extreme outer surface stone with color. Under a microscope, you you
can see the loss of color within each tiny scratch. Diffusion treatment
can also change the stone's refractive index. Also, if the stone is faceted,
the color will appear stonger where the facets meet.
Petrified Dinosaur Bone or"dino bone" is the result of fossilized
bone from dinosaurs in which the cellular structure has been replaced
with quartz, leaving the bone structure intact.
Christian Dior (1905-1957) was an influential French fashion
designer. In the 1950's, Dior jewelry was produced by Kramer (in the 1950's),
Henkel & Grosse (from 1955) and Mitchel Maer (from 1952-1956). In
1955, Swarovski and Christian Dior developed the iridescent aurora borealis
stone Licensed Dior jewelry continues to be produced.
A dog collar (also known as "collier de chien") is a type of
short, multiple-strand choker-style necklace that fits tightly against
the neck. Dog collars are also known as " plaque de cou" (meaning
"neck badge") when they are fastened by a clasp in the front.
Dog collars are 14"-15" in length.
Dog Tag Jewelry
Dogtag jewelry is based on the dogtags issued to soldiers. This type of
necklace has become popular recently. Dogtag necklaces consist of a flat,
dogtag-shaped pendant strung on a silver ball chain.
Dolomite (calcium magnesium carbonate, CaMgCO3) is a common type of sedimentary
rock. Dolomite occurs in crystals and in masses. This mineral was named
for the French mineralogist Déodat de Dolomieu (1750-1801), who
first described it in 1791.
A convex shape like the outside surface of a ball or sphere. This shape
is often used in earrings, pendants and components of jewelry designs.
A doublet (also dublette) is a gem made from two layers in order to save
expenses; the lower part of the composite stone is glass or a non-precious
stone, the top is the more valuable stone. Many different types of doublets
have been manufactured (including opal doublets). One common doublet contains
a layer of real garnet and a layer of glass. A thin, red garnet top is
glued to a colored glass bottom. A green glass bottom with a red garnet
top layer produces an emerald-like stone. A diamond is enlarged by cementing
it to a crystal base.
Doubly Refractive Stone
In doubly-refractive stones, lthe light entering the stone is split into
two light rays, and the rays travel in different paths. These stones have
more than one refractive index. Calcite, peridot, zircon, tourmaline,
and titanite are doubly-refractive stones. Bi-refringence is another name
for double refraction.
Drawn beads are cut from a long, straw-like tube of glass (the tube is
made by drawing a hot mass of glass fresh from the furnace). The sharp-edged
cut beads are often tumbled and reheated to give them rounded edges. Some
examples of drawn beads include seed beads, bugle beads, furnace glass
beads, and pony beads.
A drop cut (or briolette) is a pear-shaped cut gemstone with triangular
facets on top. This type of stone makes a nice pendant.
Drusy (sometimes referred to as: druse, druzy) is a layer of tiny quartz
crystals that form on a host stone. The cavity inside a geode is sometimes
filled with drusy quartz crystals. Although the quartz crystals may be
the source of the color (amethyst, citrine), usually it is the host stone's
color (chrysocolla, uvarovite garnet) that shows through the quartz and
gives the stone its color. (pronounced: dru-zee)
Druze is a layer of crystals that form within a mineral crust, like the
inner cavity of a geode. Amethyst crystals are often found in a druze.
The inner cavity of agate geodes are often lined with a druze of sparkling
A ductile substance is easily pulled or stretched into a thin wire. gold
is the most ductile metal.
Duettes are sets of jewelry made by the Coro, Trifari, and other companies.
Each "duette" has two clips which attach to a pin base; they
can be worn as a single pin or as two clips. The enameled bird duettes
above were made by the Coro company
Du Jay was a small costume jewelry company that made high quality (and
high priced) pieces during the middle 20th century. Rhinestones and/or
false pearls often adorned the lockets, pins, bracelets, necklaces, and
other jewelry items which were often made of silver (sometimes with a
gold wash). Du Jay items are hard to find.
The term used to describe gems which exhibit an earthy or dull luster,
meaning their surface does not reflect light very well. Plastic can be
described as having a dull luster as is clay. Hematite that does not have
a highly polished surface will display a dull luster.
Dumortierite (Aluminum Boro-silicate Hydroxide) is a blue to violet silicate
mineral that is used as an ornamental stone (and sometimes as a semi-precious
stone in jewelry). Dumortierite quartz is a massive variety of opaque
quartz that is intergrown with dumortierite crystals. Dumortierite has
a hardness of 7 - 8.5 and a specific gravity of 3.3 - 3.4.
A measure of Troy weight, dwt. is the abbreviation for "pennyweight",
a measure used to weigh gold, silver, and jewels. In Troy weight, the
pound = 12 ounces, the ounce = 20 pennyweights, and the pennyweight =
24 grains. While this method of weighing is believed to have originated
in Cairo during the crusades, the name comes from Troyes, France where
it was first used .