Ruby refers to corundum with red color. It is a kind of corundum. The main component is alumina (Al2O3), red is from chromium (Cr), mainly Cr2O3, the content is generally 0.1~3%, and the highest is 4%.
How to estimate the weight of ruby:
Round: diameter 2 × height × 4.00 × 0.0018
Ellipse: diameter 2 × height × 4.00 × 0.0020 (diameter: length, width average)
Square hybrid shape: diameter 2 × height × 4.00 × 0.0018 (diameter: vertical, horizontal and diagonal average)
Long mixed shape: average width 2 × height × 4.00 × 0.0022 (diameter: length, width average)
Square emerald shape: diameter 2 × height × 4.00 × 0.0023
Rectangular emerald shape: diameter 2 × height × 4.00 × 0.0025
Square: average width 2 × height × 4.00 × 0.0024
Drop shape: diameter 2 × height × 4.00 × 0.0018
Horse eye shape: diameter 2 × height × 4.00 × 0.0017
Heart shape: diameter 2 × height × 4.00 × 0.0021
Note: The above formula is based on the medium thickness of the waist, the pavilion is not prominent, and the symmetry is better. A thicker waist may require a correction of up to 10% (corrected weight = original weight + original weight x 10%), a prominent pavilion may require an 18% correction, and an asymmetrical shape may require a 10% correction.
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