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Glossary L : 1 - 50

Luster

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A stone's luster is its sparkle or sheen - the way it relects light.  The luster depends on the nature of the stone's surface reflectivity.  Some types of luster include: adamantine (also called brilliant or diamondlike, like a faceted diamond), earthy (with little reflectivity- also called dull, like shale or clay), greasy (like nepheline or apatite), metallic (also known as splendent, like pyrite or marcasite), resinous (like amber), pearly (with an iridescent reflectivity, like pearls or mica), pitchy (tarry minerals that are radioactive, like uraninite), silky (with a fibrous structure, like some tiger's eye or satin spar), vitreous (also known...

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Lozenge

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A lozenge has a diamond shape.  A lozenge cut stone is a step-cut gem with a diamond shape.

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Linde Star Sapphire

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Linde star sapphire ("Linde stars") are synthetic star sapphires that were first made by the Linde Air Products Company in 1947 (they also developed star rubies that year).  The Linde company later became a division of Union Carbide.  Star sapphires are sapphires that have a six-sided asterism.

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Larimar

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Larimar is a form of pectolite (with copper) found only in a single place in the Dominican Republic. It is an opaque sky blue stone with white streaks. There are often some red to brown impurities. Larimar is usually shaped and polished (but not faceted). Larimar has a hardness of 4.5 - 6.0 and a specific gravity of 2.7 to 2.9. Larimar is not enhanced. Larimar was named for Larisa (the daughter of Miguel Mendez, a geologist who helped reintroduce this stone) and mar (the Spanish word for sea).

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Lapis Lazuli

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Lapis lazuli is a rich blue opaque, semi-precious stone that has been used in jewelry since ancien times. Ground-up lapis lazuli was once used as a pigment for oil paintings. Lapis lazuli is often dyed to deepen and improve its color. Lapis has a hardness of 5.5; it chips and scratches easily. It has a specific gravity of 2.4 to 2.9. Water can dull its sheen. Lapis lazuli contains the minerals calcite (which decreases its value), pyrite (which can increase its value), and sodalite. Swiss lapis is not Lapis lazuli at all; it is dyed jasper. Denim lapis is relatively...

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Lampworked Glass

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Lampworked glass (also called torchwork) is formed from glass canes and tubes that are shaped by hand over a flame (oil lamps and bellows were originally used, hence the name lampworking).  Lampworked glass beads are made in a wide variety of colors, shapes, and designs, including millefiori, rose-like overlay beads, aventurine glass, and many others.  Lampworking was invented in the 1700's in Murano, Italy.

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Labradorite

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Labradorite (a variety of plagioclase feldspar) is a fairly abundant grayish mineral that has brilliant flashes of color (usually green, blue or red) after it is polished (called labradorescence). The crystals are transparent to translucent. There is a darker variety of labradorite (called "black moonstone") which has bluish inclusions. Labradorite is usually cut with a flat surface in order to highlight the flashes of color. Labradorite was originally found along the coast of Labrador about 1805; it is also found in Newfoundland, other parts of Canada, also known as spectrolite, the Ukraine, the Ural mountains, and the USA. Labradorite has...

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Lentil Cut

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A lentil cut stone is a cabochon cut in which the upper and lower portions of the stone are identical.

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Leather Cord Jewelry

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Jewelry strung on a thin leather cord has become popular recently.  Pendants, beads, shell, feathers, and/or sharks teeth are strung on leather to make interesting necklaces and bracelets.

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Lead Crystal

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Lead crystal is high-quality glass containing at least 10% lead oxide.  Glass containing at least 24% lead oxide is called lead crystal.  Glass containing at least 30% lead oxide is called full lead crystal.  Lead added to the melt produces very clear glass resembling rock crystal.  The process of making lead crystal was discovered by the English glassmaker George Ravenscroft in 1676.  Crystal is colored by adding various metallic oxides to the melt.  When cut and polished, crystal becomes quite brilliant.

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Lavalier

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A lavalier is a pendant with a dangling stone that hangs from a necklace.  Lavaliers were named for the infamous Duchess Louise de La Valliere (1644-1710), a French woman who was a mistress of the French king Louis XIV (and was involved in many intrigues at court).

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Lorgnettes

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Lorgnettes are glasses (or opera glasses, which are small binoculars) that are mounted on a handle.  This type of glasses was used a long time ago.

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London Blue Topaz

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London blue topaz (Aluminum silicate fluoride hydroxide) is the darkest blue variety of topaz. Most blue topaz is silver topaz that has been irradiated and heat treated, but some stones are blue naturally. London blue topaz is found in Brazil, U.S.A., Sri Lanka, Myanmar (Burma), Russia, Australia (including Tasmania), Pakistan, Mexico, Japan, and Africa. Topaz has a hardness of 8 and a specific gravity of 3.5-3.6.

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Locket

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A locket is a pendant that can open up.  Lockets can hold photos, hair, a charm, or other small, precious object.

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Lobster Claw Clasp

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A lobster claw clasp is a jewelry fastener that resembles the claw of a lobster.  A tiny spring keeps the arm of this clasp closed.  It is used to attach two other rings or links of a necklace or bracelet.

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Liberty & Company

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Liberty & Co.  was a British jewelry manufacturer that combined the Arts and Crafts style and the Art Nouveau style in their mass-produced pieces.  Liberty & Co.  was founded in 1975 by Arthur Lazenby Liberty (1843-17).  Archibald Knox (1864-1933) was the chief designer for Liberty and Co.

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Leaf

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Metallic leaf is paper-thin sheets of metals.  For example, gold, silver, platinum, and copper are rolled or pounded into metallic leaf which can be applied to surfaces.

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Lost Wax Casting

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Lost wax casting is a process of casting metal in which the original model is sculpted in wax.  The wax is then enclosed in clay and the wax is melted out, making a hollow mold.  The mold is then filled with molten metal.  The clay is broken off and the cast metal remains.  This method of casting has been used for at least 4,000 years.

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Lab Ruby (Sapphire)

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A lab ruby (or sapphire) is a synthetic (laboratory-made) stone.  It has the same composition, hardness, and specific gravity as natural rubies (or sapphires) but is much less expensive than a natural stone (since they are relatively inexpensive to create in the laboratory as comared to mining gemstones).  These lab-produced stones can be legally referred to as "real" stones [as opposed to "natural" (mined) stones].

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Loupe

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A Loupe is a small hand held magnifying device used by Jewelers. The typical magnification is 10 times. It’s used to look at diamonds, gemstones and the fine details in pieces of jewelry.

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Lever Back

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A Lever Back is a type of earring backing that hinges open and closed. Normally, this type of backing is more comfortable than a post.

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Laser Soldering

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Laser Soldering—Traditional jewelry soldering is done by applying a hot, open flame to the area of the piece needing work. Because gold is such a good conductor, the heat from the soldering can be transferred to heat-sensitive gemstones causing them to crack or change color. Laser Soldering is accomplished by directing a tiny laser beam at the jewelry. Much less heat is generated in this process. Thanks to this new technology it’s possible to make repairs on jewelry with heat-sensitive gemstones.

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