(1) สี. The ruby with the best color is called "เลือดนกพิราบแดง", นั่นคือ, the color is as red as the blood of a pigeon, with a bright red color. แน่นอน, true pigeon blood rubies are very rare. Rubies are the best in category A ("pigeon's blood"), followed by category B (pigeon blood [...]
