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. Men'S Loose Lace-Up Beach Pants Men'S Baggy Lace-Up Beach Pants,Men'S Baggy Pants,Beach Pants For Men,Polyester Cotton Pants SUZHOU INNEST IMP.&EXP.TRADING CO.,LTD , https://www.suzhouinnest.com