According to the Encyclopaedia Britannica, rubies are formed when the mineral corundum is exposed to chromic oxide in metamorphic environments between 1148 to 1238 degrees Fahrenheit. There are also two prominent methods of making synthetic rubies in a laboratory. The flame-fusion method produces a gem with notable imperfections. The flux-growth method produces a synthetic ruby that is nearly indistinguishable from a real one.Know More
Rubies are made from corundum or aluminum oxide. The corundum attains the distinctive ruby red color when chromium displaces some of the aluminum ions in the aluminum oxide; this process is called isomorphous replacement. Conditions of extreme pressure and heat in which hydrothermal fluids meet limestone are needed to create the metamorphic environment necessary to create rubies.
The flame-fusion method of creating rubies in a laboratory involves melting the essential elements and dripping the mixture onto a boule.The stone crystallizes in just a matter of hours. Because this technique leaves tiny gas bubbles and a glassy, unnatural appearance, the rubies it produces are inexpensive and mostly used as costume jewelry.
In the flux-growth method, jewelry makers melt the elements into a molten mix called a flux. The crystal takes six months to form under controlled-pressure conditions. Even their flux-rubies are not real, their authentic appearance gives them a high price -- up to $500 per carat.Learn more about Precious Metals & Gems
The Gemological Institute of America reports that rubies originated in Burma (modern-day Myanmar), based on historical references dating back to the 6th century during the Shan dynasty. The Mogok ruby mines were taken over by Burma's king in 1597.Full Answer >
The specific gravity of gold is 19.32. Specific gravity is determined by dividing the weight of the material by the weight of an equal volume of water. Gold also has a melting point of 1950 degrees Fahrenheit and it weighs 10.18 troy ounces per cubic inch.Full Answer >
According to Jewelry Notes, a black sapphire is a type of sapphire that has a nearly opaque appearance. While the stone itself is blue, it's so dark that it absorbs all light entering it, resulting in the appearance of a solid black stone.Full Answer >
Conflict-free diamonds are available from vendors such as Zales, Brilliant Earth and Blue Nile. These companies rely on the Kimberley Process Certification Scheme to ensure that their diamonds do not contribute to violent conflicts.Full Answer >