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Opaque

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OPAQUE:
Description of a gemstone that blocks light from passing through. It could be due to the number of inclusions or flaws, or it could simply be a characteristic of the gemstone; opals, for example, exhibit varying degrees of opacity.


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 ...

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 (adj, n) generally speaking, that which is not transparent, impenetrable to light. In context of gemmology, a non-transpararent gemstone such as turquoise or jasper.

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.

Opaque: A substance which is not transparent or translucent. i.e. a substance that does not allow light to pass through it.

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.

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

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

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

Opaque & 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.

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

OPAQUE. 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.

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

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

Opaque
Opaque refers to the transparency of a gemstone. Generally opaque 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 ...

Opaque, 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.

Opaque 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].

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

Opaque
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.

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

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

Opaque - 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.

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

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

Opaque stones like onyx are sometimes treated to enhance their natural color and luster.

Opaque
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 opaque.

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

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

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

Opaque agate that shows iridescent colors, usually against a brown background. The only significant sources are Mexico and the U.S.
Fire Opal ...

An opaque crypto-crystalline variety of quartz of varying colours, usually red, green, yellow, brown or white. It is of little value and used mostly for inexpensive jewelry and small ornamental objects such as ashtrays and candlesticks.

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

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

An opaque mineral, turquoise is used in jewelry worldwide. Named for the ancient trade route that brought it to the European market, turquoise means "Turkish stone." Colors range from sky blue to blue-green to apple green.

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

A semi-opaque 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.

A semi-opaque to opaque 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 opaque 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.

Naturally opaque to translucent, blue quartz is relatively rare and may have fractures of reddish brown created by iron oxide.

Jadeite
An opaque 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 opaque 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.

Jasper is an opaque 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 opaque 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 ...

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

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

Unakite is an opaque 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.

Jadeite jade: opaque often with mottled colors
Nephreite jade: transparent to opaque, creamy, often with mottled colors
(click on colour to find other gemstones)
TREATMENTS ...

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

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

Opaque black colored onyx.
Black pearls
Black pearls (also called Tahitian pearls) are dark-colored pearls.

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

Malachite is an opaque 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.

Turquoise is an opaque, 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.

Unakite: An opaque stone composed of pink feldspar, green epidote, and quartz. Metaphysical Properties: Emotional balance, spirituality. Facilitates re-birthing process. Good for healthy reproductive system and pregnancy.

Opaque: 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.

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

Black Onyx: Opaque 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 opaque 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 opaque 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.

howlite - an opaque 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 opaque gemstone which is greenish-blue in color.
- Top
V ...

Hematite - an opaque 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.

Jasper is a common, opaque, 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.

Enamel Colored, opaque 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 opaque 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 opaque
Occurrence: Contact metamorphic limestones and dolomites; magnesium-rich limestones and ultrabasic rocks; regionally metamorphosed rocks. Small, dark transparent crystals ...

Cabochon cuts are popular with opaque stones and those with asterisms or chatoyancy. In rings, most cabochon cuts feature a rounded dome surface with a flat base.

AcrylicAcrylics are a type of thermoplastic, and include transparent and opaque in varied colors. Some commonly-known acrylics are lucite and plexiglas. The bangle above is made of confetti lucite.

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

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 opaque ...

The process is usually used for opaque, semi-opaque, 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.

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

Faceted A faceted stone has small, flat-cut surfaces that make a sparkling effect on transparent stones, although translucent and even sometimes opaque stones are faceted.

Sunstone is a variety of Labradorite feldspar that generally shows an opaque "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 opaque. 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 opaque 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 opaque 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 opaque brown, yellow or green crystals up to one and a half inches long.

Jasper: is a fine grained opaque crypto-crystalline variety of Quartz (Chalcedony) that forms in a multitude of varying colors and patterns.

Lapis lazuli is a rich blue opaque, semi-precious stone that has been used in jewelry since ancient 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.

Aventurine is a translucent to opaque variety of microcrystalline quartz. It contains small inclusions of shiny minerals which give the stone a sparkling effect known as aventurescence.

Transparency: Translucent, opaque
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 is an opaque stone, often found with white, yellow, or gray inclusions and a silky luster or silvery sheen. Both the ancient Egyptians and other Middle Eastern cultures made items from amazonite.

Jasper, whose name means spotted or speckled stone, is an opaque form of chalcedony. It comes in various colors including red, yellow, brown, green and less often in blue.

Jasper is an opaque, 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.

Opal occurs in different colors, ranging from semi-transparent to opaque. 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.

These unique, partially opaque diamonds can be found in faceted form, such as the rose cut. Unlike other diamond cuts, it is flat on the bottom and does not have a pavilion.

Clarity of colored gems ranges from transparent, semi- transparent, translucent to semi translucent and opaque. Transparency on the other hand is graded in the terms of crystal, milky, cloudy, and sleepy.

At the other extreme, a diamond can be totally black and opaque. 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 opaque 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 opaque and translucent stones; the stone is given a rounded, convex shape, and cut high or low for best effect.

See also: See also: Stone, Color, Gemstone, Jewel, Jewelry

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