Ruby is a type of corundum whose main component is aluminum oxide (Al₂O₃). The red color comes from chromium (Cr), non-chromium chromogenic corundum of other colors are also collectively known as sapphire.
Ruby is red due to chromium content, the higher the content the more vivid color. Blood red ruby assortment of people cherish, commonly known as "pigeon blood red". Ruby and emerald, sapphire, tourmaline, etc. belong to the colored gemstone genus. Rubies are hard, with a hardness just below that of diamond.
[Main Provenance]
Burma
②Thailand
③Sri Lanka
③Tanzania
⑤Vietnam
⑥ China
[Selection and Grading Standards]
The grading standard of ruby is mainly based on 1T and 4C: (Transparency), (Colour), (Clarity), (Cut), (Carat).
①Transparency
In the visual appraisal of rubies, transparency is generally categorized into: transparent, sub-transparent, semi-transparent, opaque four levels.
②Color
Ruby color is mainly divided into pigeon blood red, red, pink, light red, dark red and other five colors. Closer to the better is the deeper pure red, followed by a slightly purple red, the following in turn for the deeper pink, purple red, slightly brown red, others such as brown red, blackened red, very light pink are poor ruby.
③Clarity
Clarity refers to the amount of inclusions in a gemstone. Ruby and sapphire usually contain a certain amount of inclusions, the size, quantity, sharpness and location of the inclusions have an important impact on the value of ruby and sapphire.
④Cut
Ruby cuts can come in many different shapes, depending on personal preference and style needs. The cut also includes the orientation, type, proportion, symmetry, and degree of polish of the cut. The cut affects the color and brilliance of the stone. In general, choose a gemstone with an excellent cut.
⑤ Carat weight
For rubies, if the color, clarity, and cut are equal, and considering the budget, naturally the larger the carat weight, the better!
[Assemble ruby]
The largest ruby is a 1700.01 carat star ruby. The ruby is 6.19 cm long, 4.32 cm wide, 6.48 cm high, origin Myanmar Magdalene, bright color, uncarved, the natural formation of the mountain character form, crystal integrity, the particles of the world's rare, for the world-class priceless treasure.
Carmen Lucia ruby, Smithsonian Museum (National Museum of Natural History) collection, is currently on display assorted large high-quality faceted ruby. Weighing 23.1 carats, it is an incomparable gemstone. Carmen Lucia originated in Burma in the 1930s, then moved around Europe before being purchased by an American gem collector in the 1980s.
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