A fine jewelry gift of Ruby is appropriate for the fifteenth and fortieth wedding anniversary, and makes a spectacular holiday gift, as well. For information on ruby Quality , History and Care suggestions visit Ruby Knowledge. Rubies, the most rare of the precious gem stones, are believed to bring safety and health to the wearer. The top qualities are red as you can imagine a saturated pure spectral hue without any overtones of brown or blue. A stone's clarity is the second most important factor.
Natural gemstones can have carbon inclusions or other small internal imperfections.
The most valuable stones do not have noticeable imperfections. Rubies are available in a variety of shapes and carat weight ranges, and a stone that reflects light properly will sparkle and maximize the beauty of the gem. The word red is derived from the Latin for ruby, ruber, which is from similar words in Persian, Hebrew and Sanskrit. It is the crystalline form of aluminum oxide. Corundum has the hardness of nine on the Mohs scale and second only to diamond in hardness.