Without having the ruby in front of a gemologist there is no way to tell. Rubies are graded much the same way that diamonds are.

They are graded on Cut, Color, Clarity and Carat with the exception that color has much more impact on the value.

Please see the link below for a better understanding of the grading process.

10,000

Some rubies are opaque but these are considered to be low in value. A ruby that is high in value should be almost transparent and should have bright coloring.

There are some rubies, especially Thai, that have too high an iron content to grow under black light. But unless the iron content is too high, rubies glow pinkish-red under a black light.

rubies can be anysize small big medium they are not heavy as garnets

extreme hardness

They are not overly rare, no. Rubies are found and mined in many parts of the world.

A ruby is the gemstone form of the mineral corundum and some trace minerals that influence the color.

rubies

Rubies are the July birthstone. I am born in July.

from:Camilla.gato@gmail.com