Coloured Diamonds
Fancy or intensely coloured diamonds are very rare, and are also very attractive and desirable. Because they are not actively marketed, certainly not by De Beers, knowledge levels and demand for them is still relatively low.
Fancy Colour Diamond Education
Diamond Education
Fancy Colour Diamonds
CONTENTS ...
Colour -This gemstone occurs in all possible hues, tones and shades of colours.
Colours, names and nicknames
In order to understand this variety of colour, you will have to brush up your knowledge of gemmology a little: tourmalines are mixed crystals of aluminium boron silicate with a complex and changing composition.
Colour
Relative position of a diamond's body colour on a colourless-to-light-yellow scale, denoted by standard nomenclature such as letters, numbers, words or a combination thereof.
Colour
The type of oyster or mussel is a key determinant in colour. Different geographical areas have different molluscs which produce different colours.
Cultivation ...
Colour:
When grading diamonds 'color' refers to the absence of color in a diamond. The rating scale begins at D (meaning colorless) and ends at Z (meaning having a lot of color).
COLOUR RANGE. A statement of the various colours exhibited by different specimens of a mineral.
COMBUSTIBILITY. A quality possessed by the diamond only, among gems.
colour change
See dichroism
composite suite
A piece of jewellery that is composed of more than one part, where each part may be worn separately or together as a single piece ...
Colours: White, Colourless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Grey, Black, Multi-coloured
Also see: Amethyst, Citrine, Smokey Quartz, Rutilated Quartz, Ametrine
R ...
NEW COLOURS
In the 1870s, a company called Ahrens in Tokyo employed a German chemist, Gottfried von Wagner, who introduced a wide range of new, bright colours to the dull, rather limited palette used by the early Japanese enamellers.
Fancy Coloured Diamond
A diamond with an attractive natural body colour. Colours range from yellow, blue and green to pink , red and black.
Colour
Transparent to translucent lilac to purple through bluish purple
A reddish purple colour-shift that is sometimes visible in incandescent light ...
Colours
Normally colourless or white, colourless in thin section.
Lustre ...
Colourless to pale green tinted crystals were recovered with both prismatic and pyramidal crystal forms developed.
Apophyllite has been found elsewhere on the island
in the past at The Storr, for example,
where fluorapophyllite was identified.
Colour: The tint of the diamond. For more information see The 4 Cs of Diamonds
Crown: The upper surface of a cut diamond.
CT or CTS: Carat Total Weight of a diamond.
Coloured to look like flesh, flesh plug retainers are used to conceal piercings for different purposes, such as work, school or to replace metal materials for medical purposes including X-Rays or surgery.
See our full Plug Retainers range
Plugs ...
Colour
The effect as seen for the human eye due to the different wavelengths of light.
Composite stones
Stones which are clued together from 2 or more layers to enhance the color and quality of the stone (duplet, triplets) .
Colours and Textures said...
Superb post Erica.
Rebecca - Fuchsia Bloom Studio said... ...
Coloured black to steel or silver grey, normally with a rust red streak. Highly polished and extremely popular in the Victorian era.
Hessonite ...
The colour of the gold doesn't make a difference to the gold content (karat rating). This is because the alloy has the same amount of gold in it. The gold is mixed with different metals to achieve different colours.
The colour play shows in different patterns which establish various varieties, including principally the black opal, fire opal, white opal, and water opal, and also flame opal, flash opal, harlequin opal, pinpoint opal, and hyalite.
The colour of citrine varies from pale yellow to Madeira. However, the darker citrine is generally artificially formed by heating poor quality amethyst.
The colour range is extremely varied, ranging from near white (osseous) through all shades of yellow, brown and red. There are even examples of blue and green amber.
The colour of the ruby varies from the lightest rose-tint to the deepest carmine. Those too dark or too light are not esteemed.
Harry Emanuel, 1873 ...
Green, colour change, orange, red & yellow
Family
Feldspar: (Na,Ca)AlSi3O8 ...
Dull gold colour of pyrite present in this sample, as is a vein of galena along the top edge
Kerry Cupit / John Phipps
Pyrite (massive)FeS2 ...
Onyx:
Colour ranges from black to dark brown to green and it is mined in South America, Madagascar and India. Look after your stone as it may scratch or chip easily. Onyx has been used for centuries to make brooches, jewellery and chess pieces.
The general colour of a pearl is also called the body colour. Typical pearl colours are white, cream, yellow, pink, silver, or black.
Enamel - Coloured, opaque glassy material fused onto metal, pottery or glass
Enhancer - A piece that can be clipped on to a chain or necklace to enhance its appearance
Epoxy - A resin used in strong glues and enamels ...
Window: In coloured gemstone cutting, this is a trade euphemism to mean a see-through effect through the pavilion. A cutting flaw, but not always avoidable in pale-coloured gemstones.
learning lounge
glossary
frequently asked questions ...
Beryl
A lightly coloured mineral which when transparent and dark green is called emerald. When blue in colour, it's called aquamarine.
Boyle (1664), Experiments and Considerations Touching Colours
Bowie (1878), Hydraulic Mining in California
Buffum (1900), The tears of the Heliades
Burnham (1886), Precious stones in nature, art, and literature ...
Anodizing Procedure to colour certain metals, like titanium. Electric current, going through the metal, reacts with the air and forms forming oxides. The oxidation colour varies, depending on the amount of electric current.
to enhance the gold's color - by adding a metal alloy the colour of gold can be changed from yellow to white, red, blue and even green gold. The most commonly used metals to alloy with gold are: Nickel, Copper and Silver.
Step back, look at the entire strand, and decide for yourself if they are matched for colour, even in shape, consistent in lustre and sheen from each pearl to the next, and have a very consistent appearance.
In translation, this means something like 'stone with mixed colours', referring to the colour spectrum of this gemstone, which outdoes that of all other precious stones. There are tourmalines from red to green and from blue to yellow.
Customers are primarily concerned with basic the main four features at the time of purchasing diamonds which are mostly known as "Carat Weight","Cut","Colour"and"Clarity".
It is attractive in colour and brightness, durable to the point of virtual indestructibility, highly malleable, and usually found in nature in a comparatively pure form.
Legend: The Romans first popularised Opal about 100 BC and gave it the name opalus (to see a change of colour). They prized Opal above all other precious stones and believed the holder to be charmed with good fortune.
A metal with a distinctive red colour used from the late stone age onwards. The Greeks and Romans both used the metal and its alloys, known as xaAer and aes.
Often zircon is heat-treated to produce a blue or colourless gem. Its adamantine lustre and high colour dispersion make colourless variants of zircon appear similar to diamond. As a gemstone it is relatively unpopular.
Did you know that if the diamond is poorly cut, the colour and clarity can not make up for it? The cut of a diamond is what makes a rough diamond sparkle and shine.
Jadeite is variable in colour and rarer so more valuable. Nephrite is the more common and mostly strong green in colour, but also comes in varieties of green, blue-grey, grey, yellow-brown and white. It is found in more locations than jadeite.
Platinum is a very strong, dense precious metal with a white colour. Platinum jewellery is usually 90%-95% pure, is very sturdy, and holds stones well; to strengthen the metal and increase the workability of the platinum, ...
Only inches below the surface, the colour improved and the material was of a far superior quality, becoming more transparent with depth. The colours range from pale green to dark green, and from pale yellow to an almost golden colour.
Blue Diamond A diamond with a distinctly blue body colour, even thought very light in tone, is a fancy diamond.
Turquoise come in a range of colours from sky blue through various shades of green to greenish and yellowish gray. Turquoise is opaque except in the thinnest splinters, and has a feeble, faintly waxy lustre.
Pictures are enhanced to improve the colour and they add all sorts of tags like "super AAAAA Tanzanite" and equally subjective and meaningless terms to entice the buyer.
Miracle Bead - vivid coloured beads made from plastic and fiberglass materials. Has layers of reflective coating, finished by a clear outer coating producing the illusion of bead within bead look. It also glows in natural light.
Pierdot The intensity of the colour of the stone depends upon the amount of iron contained. The colour varies from yellow-green and olive to brownish green.
Rhodonite is a glass opaque pink to rose-red mineral, often with black inclusions.
Surprisegold Engagement Rings - Coloured Diamonds
Godfrey Gardner is a craftsman who creates unique jewellery designs based on living plant forms - he will accept commissions for handmade engagement rings, wedding rings, earrings, etc.
Although it has a dirty grey colour in the rough, cut stones aquire a metallic lustre and a beautiful sheen at the right angle. The stones are usually cut with a flat surface and have been carved as cameos.
Four Cs: Four value factors (clarity, colour, cut and carat weight) that describe the quality of a finished diamond.
Freshwater pearl: A pearl produced by a fresh water mollusk.
The application of heat to a gem with the purpose of enhancing the gems colour and or clarity.
Heliodor
Lemon yellow to gold colour, meaning "Present of the Sun", Beryl group.
Pegmatite - A light coloured igneous rock containing large crystals of the minerals mica, quartz and feldspar.
All quotes reprinted with permission from "Collection and Classifying Coloured Diamonds" by Stephen C. Hofer, Ashland Press, New York, NY. Special thanks to Alan Bronstein.
June 1978 Diamond Grading and Evaluation Gemological Institute of America
October 1979 Coloured Stone Grading and Identification G.I.A.
November 1979 Gemologist, GIA G.I.A.
quality: the degree of excellence of a diamond, measured by its weight, colour, purity or clarity and its perfection of proportions and finish.
Metals such as silver, nickel, copper and zinc are frequently mixed with gold to provide certain characteristics, (such as colour or hardness). Common alloys used in the jewellery industry are 22 karat, 18k, 14k & 9k.Pure gold is 24 karat.
 See also: Stone, Jewel, Gemstone, Gemstones, Diamond
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