What is diffusion star sapphire?
The gemstone used to make a diffused star sapphire is a sapphire. The diffusion process is done on the surface of the sapphire gemstone and could extend to around a millimeter into the gemstone. The process is done to create the star effect on the gemstone and the gemstone is then called a diffused star sapphire.
What is diffusion treatment?
a situation in which research participants adopt a different intervention from the one they were assigned because they believe the different intervention is more effective.
What is diffusion Blue sapphire?
Blue diffusion-treated sapphires are be- coming more prevalent than ever before. The diffusion technique, which involves the addition of color-causing chemicnls during heat trentment, results in a thin layer of color at the surface of colorless or light-colored sapphire.
Are diffused sapphires worthless?
Sapphires that have obtained their color from diffusion treatments have little intrinsic value. Reputable dealers will identify diffusion-treated sapphires and offer them at prices well below those of natural, untreated stones.
What is gem diffusion treatment?
Diffusion treatment involves letting a certain chemical seep into a gemstone's surface under extreme heat. The process lasts a long time, usually over a week. The result? Richer color, or a new color entirely, but only on the thin surface layer.
What is a diffusion of a gemstone?
Diffusion is a technique whereby certain natural elements, those used in nature when colouring allochromatic gems, are placed on the surface of the gem during the heating process and the colour is diffused into the gem.
What is beryllium diffused sapphire?
Gem dealers in Bangkok, Thailand, are reacting to concerns that beryllium diffusion is being used on blue sapphires. Beryllium diffusion typically brightens the color of ruby or sapphire, making a stone more yellow, orange, or red, depending on the original color.
What is titanium diffused sapphire?
In 1991, titanium-diffused blue sapphires reappeared in the Bangkok market after an absence of many years. Touted as "deep diffusion," the stones proved to have no greater color penetration than the original Union Carbide product.
Are heat treated sapphires valuable?
Heating is an accepted treatment for sapphire. But for fine-quality sapphire, confirmation from an independent laboratory like GIA that there is no evidence of heat adds to a sapphire's rarity and value.
Are treated gemstones less valuable?
Treated gemstones are cheaper. Most people want to buy or wear an emerald but since an emerald costs $50K per carat (untreated), most people cannot afford it.
Is a star sapphire a real sapphire?
Blue Star Sapphire are a rare and beautiful type of sapphire. The star which shines upon its surface is an asterism, which gives the stone a six-rayed star when viewed under light.
How do you tell if a gemstone has been heat treated?
Heat treatment is a very risky process as many gems have inclusions that expand at a different rate and cause stress fractures, which then becomes an identifying characteristic of heated gems, particularly sapphire and ruby which can display halos around inclusions within the gem.
What does diffusion mean in medical terms?
Medical Definition of diffusion 1 : the process whereby particles of liquids, gases, or solids intermingle as the result of their spontaneous movement caused by thermal agitation and in dissolved substances move from a region of higher to one of lower concentration.
What is example of diffusion?
A tea bag immersed in a cup of hot water will diffuse into the water and change its colour. A spray of perfume or room freshener will get diffused into the air by which we can sense the odour. Sugar gets dissolved evenly and sweetens the water without having to stir it.
What is diffusion in nursing?
The tendency of the molecules of a substance (gas, liquid, or solid) to move from a region of high concentration to one of lower concentration. In the body, oxygen and carbon dioxide move by diffusion.
What are examples of diffusion in the human body?
The diffusion of chemicals and gases in and out of cells is an essential activity in human organs. Diffusion of oxygen and carbon dioxide gas occurs in the lungs. Diffusion of water, salts, and waste products occurs in the kidneys. Diffusion of calcium from food into cells occurs in the intestines.