Treatment

Treatment of Tanzanite Gems
Tanzanite is the gem name for the silicate mineral Zoisite. Although this fairly common mineral has long been known to geologitsts, the gem form of this mineral was only discovered in 1967.

Treatment & Enhancements
It is a norm in the gem trade for almost all gems to undergo some form of treatment or the other. In fact, literary evidences of treatments of gems are found as far back as Pliny the Elder(23-79 AD).

Heat Treatment
Heat treatment or 'annealing' is done using a combination of chemicals (beryllium, borax, lead, tantalum) and heat to permanently alter a stone's color.

Dyes, heat treatment, and irradiation are sometimes applied to produce a wide range of hues such as yellow, green, blue, purple, gray, and black in freshwater and Akoya cultured pearls.

Enhancements and Treatments
Almost all sapphires, rubies and emeralds are treated in some way to bring out their natural beauty and protect their natural characteristics.

Now that we have the extraordinary ability to color corundum (a treatment that involves far less sophistication than production of blue topaz), what should be the price for corundum artificially colored by man?

Sometimes irradiation an uncommon treatment is used to get unusual colors like clear green or dark/black smoky quartz. This process involves penetrating material with subatomic Gamma rays.

Below is a list of published articles from various sources relating to the treatment of sapphires. Please click to view any of the following:
1. "Gemstone Scandals" Karen Mazurkewich, The Wall Street Journal
Gemstone Scandals ...

Treatments / Enhancements
Almost all the sapphires in the world are heat treated to improve the clarity and color of the gemstone. The heat treatment is a common practice and is an accepted process worldwide.

treatment, heat treatment The heating of a gemstone to improve its color or clarity.
trichroic The breaking up of light into three constituent rays, each containing a portion of the visible spectrum (rainbow).

Treatments & Synthetics:
Genuine Star Rubies are usually not heat treated because heating can dissolve the rutile (silk) which causes the star to form in the first place.
Beware of Synthetic (Lab-made) Star Rubies! ...

Treatments: It is also reported that the Burmese pearls are not enhanced by "bleaching" or any other process onsite. However, after the pearls have been auctioned, anything is possible.
Gillett's Jewellers Australia ...

Treatments
You must assume that all sapphires, unless otherwise confirmed by an American Gemological Laboratory (AGL) Colored Stone Grading Report, are heat treated.

3) Treatment: What enhancements, if any, has it received?
Just to think about: Does it matter if a gem is enhanced?

HEAT TREATMENT
Heat treatment is the heating of stones to a high temperature in order to enhance the color or clarity. For example, blue-green aquamarine becomes blue with heat treatment and brown zircon becomes blue or clear. chromium .

HEAT TREATMENT
Heat treatment is the heating of stones to a high temperature in order to enhance the color or clarity. For example, blue-green aquamarine becomes blue with heat treatment and brown zircon becomes blue or clear. chromium .

Heat treatment: The application of heat to a gem for the purpose of improving its color or clarity. Many gems are treated in this manner.

Heat Treatment
The application of heat to a gemstone for the purpose of improving its depth or richness of color.

Heat Treatment
Heat Treatment is a process of applying heat to a gemstone in order to increase color and clarity.
Hessonite
Hessonite is also called Cinnamon Stone; it is a variety of garnet that is cinnamon-yellow in color.

Heat Treatment - Commonly used to change or intensify the color of a gemstone. The change alters a stone's structure and is usually permanent.
I-N ...

Heat-Treatment
Heating a gemstone material to improve color.
Heavy Liquid
A liquid of known specific gravity, used to test the specific gravity of a gemstone.

heat treatment
A method of enhancing the colour of gemstones by heating them to a very high temperature
inclusion
A small particle of another mineral, liquid, gas or some foreign matter that is contained within a gemstone ...

Heat treatment (of diamond): Heating a diamond or other gem material at a given temperature for a specified period to permit a partial or complete readjustment of the atomic structure that was previously altered by some type of treatment.

Heat Treatment: A form of gemstone enhancement done for centuries on many well-known gemstones, most particularly sapphire. A stable enhancement, usually done at source.
Hessonite: A popular bright golden or burnished garnet.

Heat Treatment
Heat treatment is the process in which heat is offered to a gemstone for the purpose of improving its color.
Hue ...

Stone Treatments / Enhancements
Natural flawless gemstones are very rarely available. Gemstones are mined in a very rough state and they require stone finishing by numerous ways to enhance the appearance and durability of stones.

[edit] Treatments
When heated, yellow topaz often becomes reddish-pink. The color change upon heating was first discovered by a Parisian jeweler around 1750.

Laser treatment
Fall 1970, Lasering diamonds, first done, p. 224, 3pp.
Winter 1971, Improved lasering techniques for diamonds, p. 370, 2pp.
Spring 1972, Laser drilling diamonds, p. 21, 2pp.

Treatment of Opal
As mentioned earlier, opal can be dyed to produce a black body color. Material that is crazed can be oiled to hide the cracks. Material can be stabilized with plastics or resins to prevent crazing.

Treatment
Artificial modification of the chemical and/or physical properties of a gemological material. In pearls, any operation for changing and improving their aspect.

Treatment usually used on emeralds to prevent numerous inclusions from detracting from the beauty of the stone. Often used on opal to prevent cracking.
Orient:
A term referring to the luster of a pearl.

A treatment process separating the valuable minerals from the host material.
Mineralization
The concentration of metals and their compounds in rocks, and the processes involved therein.

Any treatment or "enhancement" made to a diamond lowers its value. Lumera does not sell diamonds that have been treated in any way, including HPHT.
Buying Tip: ...

The treatment involves applying a coating consisting of cobalt, to pale Tanzanites in order to give them the appearance of fine stones.

Other treatments of commercial quality stones for jewelry are:
Reconstituted - Powdered gemstone material is mixed with a
coloring agent to improve the color and an epoxy type binder.
This mixture is molded to form large pieces which are then ...

A heat treatment of metals, alloys and glass to increase the strength and ductility of the material through controlled reheating to a level below its annealing temperature.
THONG ENDS
Another name for Folding Crimps.

The new treatment popular today is called HPHT- High Pressure/High Temperature treatment .

(a) the treatment is not permanent. The seller should disclose that the gemstone has been treated and that the treatment is or may not be permanent; ...

Treated, Treatment
Ignoring the fact that cutting and polishing of rough diamonds is a form of treatment, this usually refers to diamonds which have been processed in some way to enhance their colour or clarity.

Shaping and Treatment
Usually cut in round brilliants to take advantage of high dispersion and R.I.. Zircon is a brittle material and tends to chip easily, particularly along facet junctions.

Used in the treatment of heart, thymus, and immune system.
Elbaite Magical Healing Properties of the Gemstone Elbaite
keyword:
friendship ...

The yield on treatment of Missouri River sapphires is lower than for Rock Creek. It is reported that 20% to 30% of Missouri River sapphires heat-treat from deep, well saturated blue to pale, pale blue.

Diamond Color Treatments - Improving Diamond Color - Diamonds
Diamond Fluorescence - How Fluorescence Affects Diamond Color
Buying a Diamond Engagement Ring
Color Diamonds - Engagement Rings Set with Color Diamonds - Fancy Color Dia...

Annealing
Heat treatment of metal up to critical temperature during working process to release stress from cold working.

New treatments to make flaws invisible
There is a new process patented a few years ago that melts a kind of crystal into surface-breaking fractures in a diamond.

While dyes, heat treatment, and irradiation are sometimes applied to produce gray, black or golden hues, particularly in small size pearls, most South Sea and Tahitian cultured pearls are not subjected to enhancements to create or improve their color.

H
Heat treatments: Almost all rubies and sapphires on today's market have been heat treated for color enhancement. This is a permanent treatment, and therefore totally accepted in the trade.

Irradiation is a treatment used to alter or improve the color of gemstones. The process makes use of various high-energy atomic particles. Irradiation is often followed by annealing (heating) for stabilization or further improvement of color.

The final surface treatment on a piece of jewelry
fire
To heat an item until all moisture is gone and the item becomes permanently hard ...

Firing - heat-treatment in a kiln for the purpose of developing bond and other necessary physical and chemical properties.

Color-Enhanced:A treatment process that alters a gemstone's color. Heat, irradiation, dying, bleaching and oiling are among possible treatments that enhance gemstone color.

Heat-treatment turns greenish stones bluer. The best aquamarines come from Brazil. Large aquamarines are relatively common. Aquamarines are usually faceted but when they are cabochon cut, a cat's eye effect or asterism may appear.

Requires hospital admission for treatment with intravenous antibiotics.
A very uncommon complication of piercing.
Septum: Usually refers to a piercing passing through the nasal septum.

Whether light is the source of the stain I cannot tell, but it is not uncommon for some residual acid/rust stain to remain after your first treatment. Then you need a second treatment in fresh, clean acid reserved for such a purpose.

This would include color enhancements, clarity and strengthening treatments and return guarantees, in case your independent appraisal indicates conflicting information.
Keep a file of all your jewelry.
Get your jewelry appraised every few years.

" John Ruskin advises us to "seek out and cast aside all manner of false or dyed or altered stones" but, in spite of his advice, perhaps the most justifiable use of heat treatment is that which alters the color of true topaz from a wine-yellow to a ...

Heating and Radiation treatments are used to improve or change the color of a gemstone (most citrines are actually heat treated amethysts) and often remove some of the inclusions, to make the stone clearer.

Older radiation treatments involving exposing the stone to radium; newer treatments bombard the stone with atomic particles in a cyclotron (which accelerates protons, neutrons, or alpha-partices to high speeds).

In recent years, a new treatment for corundum has appeared, in which poorly colored corundum is heated in chemicals to deposit a thin (less than 0.5 mm) layer of enhanced color on the surface of the stone.

High Pressure/High Temperature (HPHT) treatment, is a process developed by General Electric whereby type IIa diamonds of low color (N-O) or even fancy brown color, ...

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