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.Continue Reading
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
Spinel gems are brightly colored gemstones that are often mistaken for rubies or sapphires, according to Geology.com. Spinel gems appear as crystals in limestone, as grains in igneous rock and as pebbles in alluvial deposits.Full Answer >
Rubellite is a red-colored gemstone differing from rubies in several ways: it is more rare than ruby; it is less dense; it is not as fiery or brilliant; and it is not as hard as a ruby. The beautiful red color of rubellite makes it desirable for jewelry, like ruby, but it is actually a tourmaline. Because it is less desirable for most buyers, rubellite is also much less expensive.Full Answer >
The four precious gemstones -- diamonds, rubies, emeralds and sapphires -- symbolize power, strength, and prosperity. Semi-precious gemstones such as aquamarines and citrine vary in their symbolism, but are typically associated with positive energies.Full Answer >
Sunflowers grow best in environments where temperatures range between 70 and 78 degrees Fahrenheit, but they can grow in temperatures ranging from 64 to 91 degrees Fahrenheit. Sunflowers are able to germinate at temperatures as low as 39 F, but growing seedlings can perish at temperatures below 28 F. Sunflowers love sunlight and grow best when exposed to direct sunlight for at least six to eight hours a day.Full Answer >