The rub test includes rubbing your ruby across a smooth (but hard) surface, like glass, and seeing if the gem leaves any color behind. Glass only has a hardness of 5 on the Mohs scale, so it’s much softer than actual rubies. Real rubies and some gems shouldn’t leave any color behind, but cheap fakes or imitations can.
How can you tell if you have a real ruby?
Real rubies glow with a deep, vivid, almost “stoplight” red. Fake gems are often dull: they are “light, but not bright.” If the gem is more of a dark red, then it may be garnet instead of a ruby. If it is a real ruby, however, know that darker stones are usually worth more than lighter stones.
Do rubies break like glass?
Glass: A lot of the fake rubies sold on the market are made of red-colored glass. … The problem with composite rubies is that they can break easily and be damaged by chemicals used in household cleaning and jewelry repairs. To see what natural rubies look like, check out the ruby selection at James Allen.
Do rubies glow under black light?
In addition, rubies found in marble typically fluoresce red under ultraviolet light—even the ultraviolet light in sunlight. Fluorescence can make a ruby’s color even more intense and increase its value. In other locations, rubies can be found in basalt rocks.
Do real rubies have bubbles?
The most notorious visual characteristic of a composite ruby is the internal gas bubbles (Figures 1 & 2). These can be single spheres or clouds of bubbles, flattened or rounded, and they are present in virtually all lead glass-filled rubies. On most occasions, they are visible even to an unaided eye.
How can you tell if a ruby is real or fake?
Artificial rubies are made of glass. Therefore, the simplest way to know if the ruby is fake or not is to compare it with a glass of similar tinge. Take a piece of red glass and compare it with the fake one. If the two matches, then the stone is a fake one.
How can you tell a quality ruby?
The finest ruby has a pure, vibrant red to slightly purplish red color. In most markets, pure red colors command the highest prices and ruby with overtones of orange and purple are less valued. The color must be neither too dark nor too light to be considered finest quality.