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Opaque stone care
Opaque stones can be ruined by chemicals. Wait a few minutes after applying hairspray or perfume to put them on; remove them before using lotion. -- In Style Magazine, July 1999
Jewelry Frequently Asked Questions
How can I test pearls and care for them?


Opaque
In gemstone use, an opaque gem is one that does not allow light to pass through. It is not transparent or translucent.
Examples: Lapis , Turquoise , and Malachite .

opaque Impenetrable by light; neither transparent nor translucent. Opacity is the quality of being opaque.
orient The iridescent effect visible in finer quality pearls; also called overtone.
overcolor A stone with a hue that is overly dark in tone, usually above eighty-five percent.

Opaque: A substance which is not transparent or translucent. i.e. a substance that does not allow light to pass through it.
Open-work: A setting that has open areas similar to filigree cut which may allow for viewing of the bottom of a stone. See Basket.

Opaque
Not transparent or translucent.
Organic Gem
Matter that is not technically a gemstone, but is derived from animal or plant life. Organic gems include amber, coral, ivory, pearl and tortoise shell among others.

~: No light is transmitted.
Translucent: Some light is transmitted.
Transparent: A high proportion of the light is transmitted.

~
Something which is not transparent and does not reflect light; dull
oxidation ...

~ & Porous gems:
Pearls, turquoise, coral etc need special care. These gems are porous i.e. they can absorb, so using a chemical cleaner, even soap may cause the stone to discolour. The best way to keep their shine, is to gently wipe them with a moist cloth.

~
The quality of not allowing the transmission of light.
Optic Character
The effect a material has on the transmission on light.

~. When no light is transmitted.
OPTIC AXIS. The line in a double refracting crystal in the direction of which no double refraction occurs.
ORGANIC. Pertaining to the animal or vegetable kingdom.

~ A term used for gemstones that you cannot see any light passing through the gem. Lapis and malachite are an example of this.

~ Seed Bead
Seed beads that are solid in colour and therefore not transparent
Pearl Seed Bead ...

~ - There are several ways a light travels through a stone. In ~ stones, no light is reflected.
Open Work - Similar to filigree, this ring setting is designed to allow viewing of the bottom of the gemstone.

~
~ refers to the transparency of a gemstone. Generally ~ stone does not transmit light as it is so thick with inclusions or flaws and due to that light is blocked from passing through the gemstone.
Optical Effects ...

~, meaning the stone will not transmit light through it.
Translucent, or cloudy, meaning that the stone transmits light, but you cannot see clearly through it.

~ sunstone with snowflakes (photo: Dan Dennis)
The addition of copper provides Oregon Sunstone with a vivid burgundy-red, reddish-brown, mauve, or orange-red color which is sometimes confused with red andesine [2]. Oregon Sunstone can be faceted or cut en cabochon.

~ to translucent. Few varieties can be transparent too.
Crystal System
Tetrahedral crystal system.

~
Holistic Aspects:
The medicinal powers of these stones linger a notorious topic, but are stated over the centuries by most healers, and spiritualists, as well. Whether it’s a detail or an excuse, it doesn’t matter, if it truly helps.

~
~ means blocking the passage of light (as opposed to translucent or transparent).

OPEN-ENDED NECKLACE
An open-ended necklace has no clasp; it is worn by tying the ends together around the neck. Open-ended necklaces usually have ornaments, like beads or tassels, at the ends.

~ variety of quartz with alternating black areas interspersed with lighter-colored lines. Color from silicon dioxide. Mohs' hardness rating of 7.

~ - describes substance that does not transmit light.
Orient - describes the depth of luster in pearl; it is created by layers of nacre.
Pavilion - the lower portion of the gemstone.

~ chalcedony, impure
Aventurine
Translucent chalcedony with small inclusions (usually mica) that shimmer.

~, translucent, and rarely transparent
Habit:
columnar, prismatic, typically twinned, and rarely massive ...

~ stones like onyx are sometimes treated to enhance their natural color and luster. To ensure the finish remains colorfast, do not wear onyx jewelry while bathing or swimming, and avoid using chemicals, detergents, hairspray and perfume near onyx.

~
A quality that describes gemstones, synthetic jewelry, or painted surfaces that denotes an inability for light to pass through the surface. The opposite quality is translucence. Turquoise or solid paint would be considered ~.

~ stones with good color are cut into cabochons,
or "promotional" grade faceted stones used in inexpensive
Birthstone jewelry. Emerald is a May birthstone.

~ variety of quartz and is usually red, yellow or brown. Sometimes with banding or stripes through the stone. 6.5-7.
K
Kunzite ...

~ A solid or non-transparent gemstone such as Onyx or Jade. If some light passes through the stone it would be translucent, not ~.
OPERA LENGTH A single strand of pearls 30" to 35" in length.

~ agate that shows iridescent colors, usually against a brown background. The only significant sources are Mexico and the U.S.
Fire Opal
Opal that's transparent or translucent red, orange, yellow, or brown. It may or may not show play-of-color. The most important sources are Brazil and Mexico.

An ~ light green to blue-green feldspar with a distinctive mottled or striated appearance that is often cut en cabochon.

An ~ form of feldspar
Amber
The fossilized resin of prehistoric pine trees which ranges in color from golden to orange-red ...

The ~ gemstone known as "lapis lazuli" is a mixture of various minerals. The chief component is lasurite, which gives this stone its typical, gleaming blue color. Lapis lazuli usually has stripes or spots of other minerals running through it.

This ~, deep blue gemstone has a grand past. It was among the first gemstones to be worn as jewellery and worked on.

A semi-~ stone that was used extensively by the Egyptians it is called the stone of courage and is said to be named after the Amazon women warriors. Some archaeological evidence suggests that the Amazonians were a matriarchal society during the Bronze Age.

A semi-~ to ~ rose quartz that is usually yellowish, reddish, or brown. The U.S. and Brazil are the most common sources. Jasper was once believed to have curative powers.
Jet ...

Clear to ~ shades of yellow, the golden rutile crystals have a near metallic luster. If quartz is heat-treated, which is often done to achieve a more uniform color, then the rutile will burn away. Rutilated quartz is not as common as other types of quartz.
sand-cast ...

Jadeite
An ~ stone of microcrystalline fibers belonging to the variety of Spodumene. Come in many colors, white ,green, pink, brown, and violet shades. Sold under the name Jade, even only one is really Jade.

Jade is an ~ stone and is thus usually fashioned into cabochons or beads. Jade bangles and rings are also extremely popular items of jewellery. The stone has held special significance for the people of China since 3000 B.C., when it was referred to as yu or royal gem.

Topaz, both ~ and translucent, can be yellow, red or orange, blue, brown or even gray, the varieties are enormous. Perhaps pink is the rarest version but it is this variety which gives you the chance to select purely on color, perhaps your favorite color.

Jade: An ~ semiprecious gemstone which is usually found in shades of green, but can be also be found in lavender and rose shades.

Jasper is an ~ and fine-grained variety of the silica mineral Chert, that has a dull luster but can be worked to a fine polish. Jasper can be found in a broad variation of colors, like Poppy, Picture, Desert, and Dalmation.

A dark green ~ chalcedony with spots of red Jasper
Blue-white
An outdated term used to describe a diamond without body color, flagrant misuse has made the term meaningless ...

Jasper is an ~, solid or patterned variety of cryptocrystalline quartz which consists of very tiny quartz crystals colored by various mineral impurities.

Unakite is an ~ mineral that is green with patches of red and pink. Unakite is a variety of granite that contains green epidote and pink feldspar (but lacks mica). It has a hardness of 6 to 7 and a specific gravity of 2.86 - 3.2. Unakite was named for the Unaka Mountains in Tennessee, USA.

Enamel
An ~ or semi-transparent glass or substance applied to a metal surface for protection or ornamental purposes.

Translucent to ~ Green (most common), Blue, Gray, Yellow and Brown with Aventurescence
Crystal Structure
Trigonal ...

~ black colored onyx.
Black pearls
Black pearls (also called Tahitian pearls) are dark-colored pearls. They are produced by the large, black-lipped pearl oyster Pinctada margaritifera (also called the Tahitian black pearl oyster), a mollusk found in the tropical Indo-Pacific Ocean.

Minerals may be categorized according to whether they are ~ or transparent. A thin section of an ~ mineral such as a metal will not transmit light, whereas a thin section of a transparent mineral will. The absorption index of an ~ mineral is high.

The transparency may be either ~, translucent, or transparent. This reflectance property is called luster. Native metals and many sulfides are ~ and reflect most of the light hitting their surfaces and have a metallic luster.

Malachite is an ~ semi-precious stone with layers of deep green and light green. It is usually found in copper mines; malachite is about 57% copper. Malachite was used as jewelry thousands of years ago by the ancients Egyptians. Malachite is usually cabochon set in silver.

Turquoise is an ~, light to dark blue or blue-green gem. The finest color is an intense blue. Turquoise may contain narrow veins of other materials either isolated or as a network. They are usually black, brown, or yellowish-brown in color.

~: A gemstone that does not allow light to pass through it. Examples would be lapis lazuli and turquoise. Openwork: A style of decoration in which areas of an object have open space or cut cuts. This allows light to pass through an item. It also serves to lighten the overall weight.

Opalescence, Opalescent - Showing an internal play of colors or iridescence. (Opal)
~ - Not allowing the transmission of any light through a mineral.
Oxides - Minerals containing a metal and oxygen as the main components. (Cuprite, Corundum) ...

Black Onyx: ~ black colored onyx.
Black Prince’s Ruby: Not an actual ruby, but a ruby-red color of spinel.
Blemish: A flaw, such as a nick or scratch, on the surface of a stone.

Hematite
An ~ mineral of iron oxide, ranging in color from deep grey to black metallic
Horn
A substance often used as a substitute for tortoiseshell which is from cow horns ...

Turquoise is an ~ stone that has been popular for centuries. Colors range from an expensive "robin's egg" blue to the less valuable green. Turquoise can darken with age and turn greenish. The best quality turquoise is "robin's egg" blue with even color throughout.
GOLD ...

howlite - an ~ white ornamental stone veined with black consisting of an aggregate of monoclinic crystals. Has been stained a turquoise-blue color. Found in California.

Turquoise
An ~ gemstone which is greenish-blue in color.
- Top
V ...

Amazonite. An ~ blue-ish green feldspar. Self-expression, confidence, leadership and communication. May enhance psychic skills. Enhances loves and soothes tense emotions and situations.

Hematite - an ~ gem which is dark gray to almost place in color. Non magnetic. (see lodestone) v
I.
Inclusion - this is a small particle of foreign matter which is contained in a mineral. Many inclusions devalue a stone, but some are prized and make it more valuable - i.e.

Jasper is a common, ~, semi-precious stone that is found in many colors, including white, brown, yellow, red, and green. Jasper is found all over the world; it is often striped, speckled, and multi-colored. Jasper has been used for intaglio carvings.

Enamel Colored, ~ glassy material fused onto metal, pottery or glass. I have created many beautiful pieces with enamel. Be sure and visit the Carmen's Treasures Store to see.

Malachite is an ~ semi-precious stone with various shades of green, often banded. It is about 57% copper. Malachite was used as jewelry thousands of years ago by the ancients Egyptians. Malachite is usually cut as beads or in a cabochon.

Pleochroism : Yellow to dark green, transparent to ~
Occurrence: Contact metamorphic limestones and dolomites; magnesium-rich limestones and ultrabasic rocks; regionally metamorphosed rocks. Small, dark transparent crystals
Crystal or stone size: to 10 cts ...

AcrylicAcrylics are a type of thermoplastic, and include transparent and ~ in varied colors. Some commonly-known acrylics are lucite and plexiglas. The bangle above is made of confetti lucite. AdamantineAdamantine means having a luster like that of a diamond.

AcrylicA type of thermoplastic, include transparent and ~ in varied colors. AdamantineAdamantine means having a luster like that of a diamond. AdulariaAcommon type of moonstone, a whitish-bluish semi-translucent stone.

on a cap, popular in the middle of the eighteenth century and the early twentieth century A Jour Open setting that leaves the pavilion facets open to the light Alloy A mixture of two or more metals Aluminum A silver white metal that is lightweight and malleable Amazonite An ~ ...

The process is usually used for ~, semi-~, or fragile gemstones that may be difficult to facet. Calibrated:A gemstone that is cut to an industry standard size in order to fit most manufactured jewelry mountings.

5-4 - Treatment: None - Color: Green with color banding Is usually found in ~ green masses, its color derived from copper. Crystals are too small for faceting, but the massive material is carved or polished in many ways to reveal the alternating bands of light and dark green.

The mineral spodumene is generally known in large ~ whitish crystals, but occasionally it appears in small specimens that are transparent and richly colored.

Sunstone is a variety of Labradorite feldspar that generally shows an ~ "schiller" effect where the metallic inclusions reflect light in a blaze of color. However, it can also come in clear stones which are suitable for faceting.

You are looking for a stone not too transparent, not too ~. You should be able to see newsprint through the stone, but the type should be blurry. This is called "semitransparent."
Look out for an overabundance of surface cracks.

Translucent jade is more highly valued than ~ jade. Jade is often cabochon set; stones with imperfections are often carved (the imperfections are simply carved away). Two different minerals are known as jade: jadeite and nephrite.

For example, the ~ tin glaze was first developed by the Assyrians about 1000BC. There was a lot of interaction between the Islamic potters and the Chinese, each pushing the other to greater innovation. The Islamic potters of the 9th c.

Apatite is the most collectable mineral at Philips Mine because they occur as translucent to ~ brown, yellow or green crystals up to one and a half inches long. They are best found within masses of pyrrhotite and are closely associated with pyrite often and the contact of these two sulfides.

Jasper: is a fine grained ~ crypto-crystalline variety of Quartz (Chalcedony) that forms in a multitude of varying colors and patterns. Found worldwide, Jasper often contains organic material and mineral oxides which give it interesting patterns, bands and colors.

Aventurine is a translucent to ~ variety of microcrystalline quartz. It contains small inclusions of shiny minerals which give the stone a sparkling effect known as aventurescence. Inclusions of mica will give a silverish sheen, while inclusions of hematite give a reddish or grayish sparkle.

Black Star Diopside is an ~ stone, relatively soft and brittle, that is usually black but is occasionally green.

Transparency: Translucent, ~
Large pieces of a single color are rare
Sensitive to heat, acids, ammonia, and hot water
Can be found in Zaire, Russia, Australia, Chile, Namibia, Zimbabwe, and Arizona
It was used as a powder for eye shadow by the ancient Romans, Greeks, and Egyptians ...

Jasper, whose name means spotted or speckled stone, is an ~ form of chalcedony. It comes in various colors including red, yellow, brown, green and less often in blue. Jewelry makers find that it provides a myriad of opportunities for use in their designs.

Jasper is an ~, impure Chalcedony, usually red but also yellow, green, and grayish blue. Association with other minerals gives jasper nice bands and patterns. In the ancient world Jasper was a favorite gem. We can find the name jasper in ancient Hebrew, Assyrian, Greek, and Latin.

Opal occurs in different colors, ranging from semi-transparent to ~. The most common is white opal. Crystal or water opal has a colorless body. The most valued variety, black opal, has a dark blue, gray, or black body color.

Clarity of colored gems ranges from transparent, semi- transparent, translucent to semi translucent and ~. Transparency on the other hand is graded in the terms of crystal, milky, cloudy, and sleepy. These terms are mostly used to describe the basic nature of a gem.

At the other extreme, a diamond can be totally black and ~. In between these extremes, the color brown/yellow increases in intensity from a totally clear D to the beginnings of a faint yellow/brown beginning with J-K grade.

The early glass beads were normally of ~ glass, frequently blue, with decoration often in yellow. The Roman beads followed the Egyptian tradition. In Venice, in the 11th century and subsequently, glass beads were made for trade.

cabochon - An unfaceted form of cutting, used for ~ and translucent stones; the stone is given a rounded, convex shape, and cut high or low for best effect.

JASPER- (14th century) A form of ~, usually patterned, chalcedony which is found in massive formations. The mineral is usually stained by impurities and occurs in various colors such as red, green, yellow and blue.

It is transparent to ~ and is found in metosomatically altered magnesian or dolomitic limestones in contact-metamorphic aureoles. A blue Tourmaline emanates a high degree of harmony and are reported to bring about openness and tolerance.

A fine-grained quartz, jasper is ~ and most commonly exhibits a brownish-red
color, but it can also appear in green, yellow, brown or black. On Mohs' scale of
hardness, jasper is 6.5-7. Primary sources include Egypt, Australia, Brazil, India, ...

*Earthenware - thick, ~, porous-bodied dinnerware made from clays that cannot sustain as high a temperature as fine china. Earthenware is generally heavier, and its porous body cannot withstand temperature extremes such as going directly from the freezer to the oven.

And ~
But just adding the glass onto metal and heat it, will of course not give the most fabulous and artistic effect, so naturally there are several techniques involved to create these beautiful jewelry pieces. Follow the links below, and you can read all about them.

About: Picture jasper is ~ and comes in a wide variety of mixed shades of brown, yellow, tan and black. So named because in a lot of specimens, landscapes are often perceived. Its used a lot in making southwestern jewelry.
Metaphysical Properties or Lore: Facilitates inner journeying ...

The only proper use for the term onyx is to describe the ~ chalcedony composed of straight, parallels bands of black and white. The term is used incorrectly when applied to grayish chalcedony or agate, which has been dyed since ancient times to produce a material known as black onyx.

Included Crystals - light, dark, transparent or ~ minerals trapped inside a gemstone. In sapphires, you can frequently find minute crystals of hematite, zircon, spinel, calcite, and mica, for example.
Liquid Inclusions - liquid-filled spaces within a gemstone.
...

Rhinestone effect in which a section or swirl of ~ color, usually white, is contained in the transparent stone.
gold filled
Base metal sandwiched between layers of gold. In the US the gold layer must be at least 1/20th of the total weight and is marked: g.f.

soluble in HCl or HNO3, turns ~ and darker on exposure to light, named after J.G. Vivian, English Mineralogist
Photos
& Locals:
1.) Moroccocala, Oruro Dept.,Bolivia
2.) Moroccocala, Oruro Dept.,Bolivia ...

A cutting style that produces a convex surface with no reflecting facets, the stone has the shape of a dome. Used on ~ or semi-~ stones.
Calibrated:
A gemstone whose dimensions are a standard (mm) size and are cut to fit ready made jewelry findings or pieces.

Hematite
A lustrous, ~, blue-black to silvery gray mineral often used in jewelry. Hematite is iron oxide (Fe2O3) and is found in England, Mexico, Australia, Brazil, and the Lake Superior region of North America.

There are some ~ gems like opal, coral, carnelian and lazuli recognized as beautiful as well.
The color of gemstone is decided by hue, tone and saturation.
Hue represents the purity of color.

See also: See also: What is the meaning of Stone, Color, Gemstone, Jewel, Jewelry?

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