Gemstones (Colored Stones) for Sale
All prices are in US dollars. Unless otherwise noted, these stones are all natural in origin and have not been dyed, irradiated, fracture-sealed, or otherwise enhanced, ...
Colored Stones : Optical Properties
Introduction:
Of all the various properties of a gemstone the optical characteristics are of unsurpassed importance.
Colored Stones
A gemstone other than a diamond.
Crazing
The tendency of Opals to crack when exposed to heat or drying air. Also known as Checking.
colored stones Refers to gemstones that are non-diamond. Also referred to as soft stones.
conchoidal A type of fracture that is non-diamond such as glass. Resembles a shell-like smooth surface.
Colored stones: When discussing a faceted stone, the first distinction that is often made is shape (face up outline). As is also true of diamonds, colored stones are either rounds or fancy cuts. So ovals, pears, freeforms, etc. are all "fancy".
Colored stones are mined in a large number of places, with the largest producers being Brazil, parts of Asia (including Sri Lanka, Thailand and Burma), and several countries in East Africa (including Kenya and Tanzania).
Colored stones evolved as talismans and amulets. They were thought to offer predictions for the future, to protect the wearer from harm and to aid healing. As such, they became important traditions in many religious practices.
Colored Stones.
Another great look is the wedding band with alternating diamonds and colored gemstones - most often rubies, sapphires or emeralds.
Colored stones are all about many characteristics of color:
- Color tone
- Saturation
- Purity of color ...
Colored stones remained very popular as well. Sapphire, ruby and emerald being the most sought after stones.
Colored stones are also mounted in white gold earrings apart from diamonds and pearls. Few to name are amethyst, pink tourmaline, blue topaz, pink sapphire and so on.
Colored stones have different habits of clarity, so that they are classified into three 'Types', which are defined as under: ...
COLORED STONES All gemstones other than Diamonds, or colored Diamonds.
CORUNDUM A gem species that is found in many colors. Red Corundum is called Ruby and all other varieties are called Sapphire.
When cutting colored stones in the brilliant cut, especially if the material is very costly and its color in need of being darkened or lightened, ...
diamond & colored stones
diamond certificate
compact diamond certificate
color certificate
arabic diamond certificate ...
The change from colored stones in the late eighteenth century to the use of silver set with diamonds and pearls also affected the brooch. From 1780 onwards, small works of art became popular.
A ring set with colored stones, the first letters of which spell the word regard, ruby, emerald, garnet, amethyst, ruby, diamond. Popular in the second half of the 19th century signifying friendship.
Repoussé ...
The most popular of colored stones. Birthstone for May. Color and clarity highly variable, major factors in valuation.
In jewelry, this period was characterized by delicate filigree in white gold and platinum, with diamonds and pearls predominating, and colored stones used less frequently, producing a light, monochromatic look.
There on my desk lay a quantity of perfectly colored stones - not usual from the New Mexican mines. True turquoise they undoubtedly were of the correct specific gravity, and cutting, when tried with a knife, with the characteristic soapy, ivory feel.
The green Mali garnets are brilliant stones; even the brown-colored stones are highly desired. The most famous green garnet, tsavorite, is an emerald-like stone discovered by British geologist Campbell R. Bridges in 1967, in Northeast Tanzania.
Colored Stones
Alexandrite
Alexandrite is unique and unusual due to the fact that its color changes when exposed to different forms of light. When viewed under natural daylight equivalent light, alexandrite looks blue-green.
A debutante in the society of gemstones, first discovered in 1962, tanzanite is one of the newest and most exotically colored stones. It was introduced into the marketplace by Tiffany & Co.
Colored stones are almost never as clean as diamonds and they should not be judged by the same criteria. The bottom line is there is no standardized grading system for clarity: it varies by gem type.
Fine-quality, brown colored stones have been cut from axinite from deposits in Calaveras, Madera, Riverside, and San Diego Counties. Benitoite, the State gemstone, is the collector/specialty stone for which the State is best known.
Bangles to cuffs, tennis and charm bracelets, mesh gold with vivid colored stones, the variety of statements available in bracelets is as unlimited as your imagination. In a word, bracelets are fun.
Fluorite is a mineral that comes in many colors, including purple, clorless, red, pink, yellow, green, blue, black, and multi-colored stones. Crystals are transparent to translucent.
When setting colored stones, it is extremely important to place the stone in the mounting in exactly the same position each time you test fit the stone while cutting the seat. This is due to the fact that most colored stones are cut irregularly.
They also conform to the industry's standards on colored stones which dictate that the deepest and most vivid colors are finer. Whilst some would disagree, and prefer the paler lilac shades, the market tends to conform with the industry standard.
Brilliant Cut - The most common style of cutting for both diamonds and colored stones.
The most common style of cutting for both diamonds and colored stones. The standard round brilliant consists of a total of 58 facets: 1 table, 8 bezel facets, 8 star facets and 16 upper-girdle facets on the crown; and 8 pavilion facets, ...
Round Cut or Brilliant Cut: The most common style of cutting for both diamonds and colored stones.
The Gübelin Gem Laboratory in Lucerne, Switzerland is one of the leading testing laboratories in Europe, testing colored stones, fancy colored diamonds, colorless diamonds, and pearls.
The electronic carat balance can also be used for the weighing of specific gravity in the determination of diamond imitations or in the examination of colored stones (Fig 390). Additional accessories can be bought for these purposes.
designs - creating excitement via colored stones, new types of clasps, multi-layered strands, multi-colored strands and lariat styles.
Upon the top of the canopy, which is made like an arch with four panes, stands a peacock with his tail spread, consisting all of saphirs and other proper colored stones.
Many fine quality colored stones such as ruby, Citrine or Topaz are transparent.
Mint Condition: A piece of jewelry having no signs of wear whatsoever, including no discolored stones. A piece that is in Mint Condition is in virtually the same condition as it was when it left the manufacturer.
Engagement rings with colored stones also are an emerging trend, with colored diamonds being quite the rage. Many celebrities, such as Jennifer Lopez, have chosen colored diamond engagement rings and this has cemented their popularity.
Pleochroism: Variation in absorption with direction in doubly refractive colored stones. Uniaxial crystals can potentially show two colors, while biaxial crystals may show up to three colors.
Greenish black and pistachio-colored stones are most favorable for reflecting, conducting and projecting healing earth energy back into the environement.
Epidote Magical Healing Properties of the Gemstone Epidote
keyword:
emotional cleansing ...
The heart cut imbues diamonds and colored stones with a touch of romance. As the name implies, a heart-cut stone is shaped like a heart.
CHANGE OF COLOR (COLOR CHANGE) - A phenomenon of some colored stones in which the gem material appears a different color in different types of light.
Spessartites are generally cut similar to other colored stones, with ovals, cushions, trillions and emerald cuts being most common.
In the market, tsavorites are found in a variety of shapes and cutting styles. Ovals and cushions are the most common ...
Colored stones were utilized more, and the opaque stones such as jade, onyx and coral were set in geometric shapes. Sleek animals such as Borzoi and Greyhound dogs were featured in some designs.
Quartz cystals of different colors often form together to form interesting bi-colored stones. These can be part natural citrine and smoky quartz, or amethyst and colorless quartz, these gemstones are very attractive.
The name tourmaline comes from a Singhalese word, « touramalli », meaning "mixed colored stones" and was originally applied to an assortment of colored stones consisting mainly of zircons.
A person who has completed studies in DIAMONDS, COLORED STONES and GEM IDENTIFICATION. He or she should have sufficient experience in the jewelry business to properly apply these studies to appraisals.
Girdle ...
Tanzanite is a fairly high valued gemstone and falls in a class just below the three big colored stones, emerald, ruby and sapphire (which it resembles). Tanzanite can be heat treated to enhance its color and remove any yellow or brown overtones.
The step cut is generally used for colored stones. This cut is rectangular to square and has many facets parallel to the edges of the stone.
STERLING ...
Intarsia...Mosaic inlay work using colored stones. (and wood)
Ion...Electrically charged atom, radical or molecule.
Certified Gemologist: A title awarded by the American Gem Society. To qualify, a person must study colored stones and their identification and diamond grading and appraising. After passing an extensive test he is awarded this title.
Fluorite occurs in many colors including purple, colorless, red, pink, yellow, green, blue, black, yellow, and multi-colored stones. Crystals are transparent to translucent. Fluorite is relatively soft and easily scratched limiting its use in jewelry.
For many colored stones, the intensity of the color is the key to value.Your American Gem Society jeweler can introduce you to an array of gemstones that will please your eye and accent your wardrobe.
The gem was first discovered in Brazil, and the pink and cognac-colored stones were worn by Russian czarinas, earning the stones the name "Imperial Topaz." Today, topaz is found in Brazil, Mexico, Sri Lanka, Africa and China.
Graduate Gemologist is the designation given to a person who has successfully completed GIA's Graduate Diamonds diploma program and GIA's Graduate Colored Stones diploma program.
Cutting standards are far more relaxed for colored stones than for diamonds. Most rubies are faceted overseas, producing what the trade calls "native cuts." Dealers here often have to recut off-center which produces asymmetrical gems.
Jewelry that has been set with a number of different colored stones usually placed to correspond to the color spectrum (red, orange, yellow, green, blue, indigo and violet).
Raindrop Earring ...
Absorption spectrum
The light of certain wavelengths is absorbed more strongly depend on material and produce dark line or gaps when passed trough the colored stones it can be seen when viewed with the spectroscope. It is used for identification.
In the past, the Madeira colored stones were the most valuable, but today, the more vivid yellows and oranges are the most popular. Natural bright yellow citrine is the most rare of the quartz varieties.
 See also: Stone, Color, Colored stone, Jewel, Gemstone
  
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