Diffusion
(Redirected from Diffusion Treated)
Diffusion treatment is a treatment used to alter the color of a gemstone (mostly for sapphires). Smaller atoms of mainly beryllium enter the lattice of the crystal and diffuse deep in it.
This bulk-diffusion treated orange sapphire is typical of those which have created the recent controversy. Note the obvious layer of orange color that exactly conforms to the surface contours of the gem.
DIFFUSION TREATED
Diffusion treated stones are color-enhanced (not naturally colored) stones. The diffusion process only colors the outer surface of the stone, so chipping or repolishing will result in a loss of color.
Diffusion
Diffusion is the process of color enhancing a stone by heating the stone in the presence of iron oxide, chrome oxide or similar compounds. The process colors the stone by infusing the outside surface of the stone with color.
Diffusion Topaz Treatment
White, or clear topaz can be treated using the "Diffusion Topaz Treatment" which will create "Peacock Blue", "Sapphire Blue", "Apple Green", and "Emerald Green" topaz colors.
Diffusion:
Diffusion is an enhancement method, commonly used with corundums. The process lies in adding iron and titanium during the heating process of a gemstone. Sometimes it is called surface diffusion.
Diffusion Treatment A form of heat treatment that adds one or more chemicals to the heating process to change the color of a gemstone. Typically the treatment does not penetrate deep into the stone, so gems treated in this way cannot be recut.
Diffusion Treated
Diffusion Treated is stones that have had their colors altered or enhanced.
Dog Collar
Dog Collar is a tight fitting necklace like a choker.
Diffusion: (AGTA Code = U) When gems are diffused, they are heated to very high temperatures, just to the verge of their melting points.
Diffusion (Sapphire, Star Sapphire)
Lasering (Diamond)
SOURCES OF ORIGIN
(Italic denote major production) ...
Diffusion: The use of chemicals in conjunction with high temperatures to produce color and/or asterism producing inclusions.
W ...
Diffusion
Diffusion is the process of enhancing the colour of a stone by heating it in the presence of compounds such as iron oxide, chromium oxide and titanium dioxide.
Diffusion treatment is another method that adds color to corundum-usually sapphire, although diffusion-treated ruby can be found on the market in small amounts.
Diffusion is a process in which surface color of gemstones is enhanced through the use of chemicals in conjunction with high temperatures. This treatment is usually used for rubies and sapphires.
Fracture-Filling ...
Diffusion is a newer treatment in the realm of gems. It is used to alter or improve the color. Diffusion has been used on various gems, but most noticeably sapphire, producing a range of bright colors from yellow to red.
[U] Diffusion treated.
one of a kind
excellent 6 rayed star.
Blue Star Sapphire$ 1,049.99 ...
Surface diffusion - A relatively new color treatment for grayish blue sapphires that is gaining acceptance. It has been controversial because although the treatment is permanent, it is only skin deep and can be scratched or polished off.
Chemical Diffusion - This is the addition of a chemical to
the surface of a gemstone under extreme heat to produce
an intensification or a change in the color of a gemstone.
The chemical actually diffuses into the surface of the stone, ...
Detection of Bulk Diffusion
In this recently developed process corundum is heat treated in the presence of beryllium. This causes a diffusion of color through most or all of the stone.
The newest method of deepening the natural color of a sapphire is bulk diffusion, whereby beryllium or a similar element is diffused into the surface of the gem, producing richer color.
HD = Heat + Diffusion (aka 'bulk' or 'lattice' diffusion): Alteration via heat and outside-in diffusion of foreign elements other than hydrogen. Example: Beryllium-diffused sapphire
HF = Heat + Flux: Alteration via heat and flux.
In recent years a treatment called "surface diffusion" has been developed to produce pinkish-orange colors from lighter colors. A trace of the element Beryllium is added to the stone during this treatment.
Diffusion of elements is relatively slow in garnet compared to rates in many other minerals, and garnets are also relatively resistant to alteration.
Occasionally, colorless to pale blue sapphire is diffusion treated. This process alters the color of a gem by exposing the surface to certain chemicals (the same used by nature).
A synthetic diamond has the same clarity, rigidity, light diffusion, refractive index, specific gravity, and surface gleam as a natural diamond. Diamonds are always in demand irrespective of fluctuating economic conditions of nations.
Today a new method of artificially coloring the surface of paler rubies through the diffusion of beryllium, or a similar element, has made the red of ruby more affordable.
Until recently, only diffusion-treated blue sapphires were known, but the Fall 1995 issue of GIA's Gems and Gemology describes some diffusion-treated rubies, so other colors, and perhaps other stones, are likely to be entering the marketplace.
Here are preformed cut (roughly shaped) light colored sapphires that have been heated in a diffusion process using Be (Beryllium) gas. They were then faceted and polished into unbelievably uniform colored sapphires.
Color strengtening: diffusion of colour causing elements through intense heating
Color: surface reaching fissures may be treated with oil or dyes, resulting in stronger colours. Treatment not durable and requiring special care ...
Often, sapphires used in jewelry are heat-treated or given chemical diffusion to enhance their color, these enhancements are permanent.
Sapphire is the birthstone of September.
CEYLON SAPPHIRES ...
Some colorless or pale stones are treated with chemicals (diffusion treated), which improves the surface color only. This could create a problem if the stone is ever chipped or nicked and needs to be recut or repolished.
Sources: Congo, China, Mongolia, or Tibet, but its actual origin, or whether it has been diffusion treated is rarely disclosed.
Also see Labradorite
Apatite ...
Metamorphism is thus driven by the imperative of chemical equilibrium but regulated by kinetic processes such as the diffusion of ions.
In addition, white sapphires are treated with a diffusion process to turn blue. This has increased demand for these gems and put upward pressure on their price. White sapphire now trades between $100-$300 per carat.
components that are permanently joined, by applying special metal alloy called solder to the surfaces of the future seam, heating them, so that the solder flows into the molecular structure of the heated pieces of metal and unites them by diffusion.
Bright yellows and oranges are the result of heat-treating, whereas heat-treating improves the color of some pinks by removing colors that can interfere with the desirable pink shades. Montana sapphires can be diffusion treated, ...
 See also: Color, Stone, Gemstone, Natural, Treated
  
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