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But it also leaves some room for error, so beware of these murky waters if someone is trying to sell you a ruby that looks a lot more to you like a pink sapphire!
Clarity refers to the number, size, color, location, and quality of imperfections in the ruby, which are known as inclusions.
When a gemologist measures the clarity of a diamond, they use 10x magnification to get a super-magnified view of the inside of the stone.
The better the clarity, the more expensive the ruby. Today most rubies are heat-treated to improve color and clarity, but rubies that are not and have superb quality can fetch big money at market.
Interestingly enough, there is one example of inclusions actually increasing the value of the ruby.
This is a rare occurrence called asterism in which three or six-point stars are visible in the stone when viewed under proper lighting.
Unlike with diamonds, rubies are not graded on cut quality. This is because the cut of a ruby is much less of an important factor to consider than its color and clarity.
But as is the case with most gemstones, the true glow of the ruby is only revealed after a quality cut that maximizes light return and color.
There are four factors gem cutters must keep in mind when cutting sapphires and rubies. Having said that, you should also be aware that there are usually price jumps when you hit one carat, as well as three and five carats.
If you want to buy a one carat ruby, consider going for a 0. Rubies come from all around the world and are available in a range of different shapes and red shades.
Common types include:. Like diamonds, rubies are cut into a variety of shapes. While the round brilliant cut is the most common shape for diamonds, rubies are typically shaped based on the formation of the stone rather than as a method of maximizing brilliance and fire.
Rubies are increasingly becoming an alternative to diamonds for engagement rings and other jewelry. Differences between rubies and diamonds include:.
Rubies and sapphires are both varieties of the mineral corundum and share a large amount of the same chemistry.
The key difference between rubies and sapphires is chemistry and color. Rubies contain trace amounts of the element chromium, which gives the stone its red color.
Sapphires may contain several different trace elements that contribute to their color. Just like diamonds , rubies can be created in a lab.
Lab-created rubies tend to be much cheaper than natural rubies. They also tend to be produced without the flaws that are present in natural rubies.
From a chemistry perspective, a lab-created ruby is the same mineral as a natural one, with identical chemical properties to a natural stone. Origin and color greatly affect the value of a ruby.
For more information on ruby quality factors, consult our buying guide and appraisal guide. Choosing a Ruby Engagement Ring Stone.
Ruby and Sapphire Grading Tools. Ruby and Sapphire Origins. Ruby , Thailand 3. Ruby is gem-quality red corundum. The color comes from traces of chromium.
All other color varieties of gem-quality corundum are referred to as sapphire. Most gemological authorities expect a medium to medium dark-red color tone in a ruby.
Stones lighter than this are called pink sapphire. However, there is no general agreement on how to draw the line between rubies and sapphires.
Depending on the chromium and iron content, rubies have a color range that includes pinkish, purplish, orangey, and brownish reds.
The trace mineral content tends to vary with the location of the geological formation which produced the ruby. While lapidaries usually facet high-quality ruby for jewelry, they also use great quantities of low-quality ruby rough to make beads, carvings, and other ornamental objects.
Three carved rubies, Gem carvers can create intricate objects from this material. This ruby-in-zoisite carving marshals all the colors in this material to create a wonderful, naturalistic underwater scene.
Few other gems have as much myth, lore, and romance surrounding them as rubies. Over the centuries, many cultures have associated them symbolically with wealth and power.
One of their chief attractions was the protection from misfortune and illness they supposedly afforded their lucky owners. However, many famous, genuine rubies have fascinating histories , too.
Augsburg, Germany, ca Gift of J. Pierpont Morgan, Metropolitan Museum of Art , New York. Public Domain. Stones from Myanmar tend to have purplish red colors.
Thai stones tend to appear more brownish red. Photo by Cliff. Licensed under CC By 2. Rubies fluoresce in long or shortwave ultraviolet light.
Myanmar rubies often fluoresce so strongly that the effect is noticeable even in sunlight. They literally seem to glow, and aficionados greatly admire them.
If this rutile is sufficiently abundant and precisely arranged, proper cabochon cutting can create star rubies.
Today, there are heating and diffusion processes that can increase the rutile content and improve the star effect in such gems.
Inclusions can also help identify the source of a ruby. Archived from the original on December 30, Retrieved December 23, Archived from the original on March 30, Retrieved March 30, Minerals: their constitution and origin.
Cambridge, U. Brunswick House Press. Bangkok, Thailand: Gemlab Inc. Zeitschrift der Deutschen Gemmologischen Gesellschaft in German. Deutschen Gemmologischen Gesellschaft.
GIA Global Dispatch. Gemological Institute of America. February 16, Archived from the original on June 14, Retrieved January 22, Archived from the original on September 27, Retrieved August 19, Bibcode : Natur.
Archived from the original on August 19, Archived from the original on March 9, Retrieved February 28, Archived from the original on July 29, Retrieved November 8, Retrieved on Archived from the original on December 29, Retrieved March 17, May 13, Archived from the original on May 13, New Licenses for Avengers: Endgame.
Spider-Man: Far From Home. Captain Marvel. Marvel Rising: Secret Warriors. Spider-Man: Into the Spider-Verse. Star Wars: Resistance. Baby Shark.
Chilling Adventures of Sabrina. Black Lightning. The Curse of La Llorona. Occasionally also used to describe synthetic Ruby. Ruby Zoisite has pretty contrast and is used as a minor gemstone, being polished into cabochon s and carved into ornamental figures.
Many deceitful names are given to less valuable red gems in connotation with Ruby. Many of these names are used by unscrupulous dealers to confuse inexperienced buyers.
Generally speaking, any time the word Ruby is used with a prefix except for those outlined above , it is a fake or a less valuable red gemstone.
The red Garnet gemstone Pyrope is particularly vulnerable to be called Ruby with a tacky prefix. Rubies are often heat treated to improve color as well as burn out certain inclusion s.
It is common industry practice to heat treat Rubies, and untreated Rubies with excellent natural can be exceptionally valuable.
A recent practice in the gemstone industry is to fracture-fill Rubies to conceal flaw s. This is done by heating them in molten lead glass which has a very similar refractive index to Ruby gemstones.
Fracture-filled Rubies are significantly cheaper than their more authentic counterparts, and because of this one should always buy Ruby from a reputable dealer.
The center of Ruby gemstone trade is in Bangkok, Thailand. The Chantaburi Province in Thailand has always been an important source of Rubies, producing gems with excellent clarity but with less desirable browner tones.
However, the color of Thai Rubies are able to be improved by heat treatment. The Thai Ruby deposits were exhausted in the 's.
The most valuable Rubies with the finest natural color come from Mogok, Burma Myanmar. There are strict trade embargoes and restrictions again Burma for its human rights violations, and several countries, especially the United States, ban any exports from this county.