Depth of Color
The combination of tone and saturation that determines how noticeable a color is.
Fancy Color Diamond ...
Deeper colors are more highly prized than lighter ones, unless the depth of color is so great as to make the stone appear blackish. The best color for any gemstone should be obvious from several feet or even several yards away.
Depth of color and tone important; most inexpensive gems are too dark or light and contain undesirable overtones (e.g. blue with gray, pink with brown).
Clarity is a factor; most tourmaline is lightly to heavily included as rough.
A good cut displays an Aquamarine's depth of color and liveliness while revealing the fewest imperfections. Aquamarine is found mainly in Brazil, Nigeria, Zambia, Madagascar and Ukraine.
What matters is the depth of color - how deep and vivid the color is. Here you look at the 2 numbers following - in the case of the Tanzanites on our site this is usually 6/5.
However, because of their relatively low energy the depth of color is only around 0.2 mm to 0.5 mm. Green-blue, pale blue and blue-green color hues at first and then blend into the above-mentioned colors as a result of subsequent heating.
Color Grading: A system of grading diamond colors based on their colorlessness (for white diamonds) or their spectral hue, depth of color and purity of color (for fancy color diamonds).
In deep dark blue sapphires, the same process tends to lighten these dark blue sapphires to a depth of coloration which is more desirable. This occurs when iron is converted from the plus two valence to a plus three state.
However, due to the depth of color or inclusions, you may not be able to discern an exact representation of the object as you would if looking through a transparent window glass.
Objectively, each is exactly the same, but that depth of color is about the deepest that will ever be found for aquamarine and the about lightest possible for any pyrope.
Foil: The reflective coating on the back of a gemstone or rhinestones to increase brilliance and depth of color. It was often used on gemstones in the 18th & 19th centuries. Today, foiling is mostly used on rhinestones.
Fancies are valued for their depth of color, just as white diamonds are valued for their lack of color. They vary in color richness or saturation from "faint" to "vivid," with the latter grade reserved for stones with the deepest saturation.
"Pleochro." = Pleochroism : Ability to have different color or depth of color when viewed in different directions.
Most Black Onyx that is commercially available today is color enhanced (heated and dyed) to increase it's depth of color.
see other December birthstones
Onyx Jewelry and Cabochons ...
By lengthening the time that a stone is heated, and/or by increasing the treatment temperature you would increase the intensity and depth of color, while also increasing the unwanted telltale inclusions.
White gold, if left uncoated, will usually lack luster and shine because of the metal alloy. The natural color of white gold is actually a light grey. Generally, white gold is coated with a very thin layer of rhodium to give it greater depth of color ...
This plump, rounding character permits the saving of weight of the rough material, and by massing the color gives usually a greater depth of color than a brilliant of the same spread would have if cut from similar material.
Since chemical testing has become more common, it's been discovered that many of the world's most famous rubies are not rubies at all, but either garnet or spinel. While still beautiful, they don't possess the hardness nor the rich depth of color ...
Well formed Almandite crystals are very popular among mineral collectors.Almandite has a brilliant luster, but its transparency is frequently marred, even in very clear stones, by excessive depth of color.
The value of an emerald is determined by depth of color, brilliancy and relative freedom from flaws, for flawless emeralds are practically non-existent.
The yellow type shows differences in depth of color as you turn the stone.
Comments: biaxial +;
Hornblende
Crystallography: monoclinic
Colors: green (adenine); blue green (parasite) to black
Luster: glassy
Hardness: 5 - 6 ...
 See also: Depth, Color, Stone, Gemstone, Gem
  
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