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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 ...

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.

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

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.

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.

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 - A term referring to the transparency of a gemstone; opaque materials do not transmit light.

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 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 ...

Not transparent or translucent; impenetrable to light; not allowing light to pass through.

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 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.

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 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
Translucent chalcedony with small inclusions (usually mica) that shimmer.

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

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

Something which is not transparent and does not reflect light; dull
Metal blackened by a reaction with oxygen. The appearance is accomplished by chemical means.

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.
Kunzite ...

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
The fossilized resin of prehistoric pine trees which ranges in color from golden to orange-red ...

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.

Jasper - opaque, dull red (FeO); also green, dull blue, or black
Ribald Jasper - general term for banded Jasper
Chert - White, gray or black, glassy, and containing fewer impurities than jasper. Not usually a gem material ...

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

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.

Topaz, both opaque and translucent, can be yellow, red or orange, blue, brown or even gray, the varieties are enormous.

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 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
An outdated term used to describe a diamond without body color, flagrant misuse has made the term meaningless ...

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

Opal: An opaque, translucent or transparent gemstone, always cut en cabochon and sometimes carved. White, grey, yellowish to black body colour. In the finer qualities, opal displays all spectral colours in pin-fire, patchwork or flash patterns.

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)

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.

5-4 - Treatment: None - Color: Green with color banding Is usually found in opaque green masses, its color derived from copper.

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.

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

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