People usually call the inclusions in gems “impurities.” ดังนั้น, the inclusions in gems are also a factor in evaluating the quality of gems; ตัวอย่างเช่น, in the quality evaluation of diamonds, an important criterion is “ความชัดเจน”, นั่นคือ, the cleanliness of the interior of the gem. โดยทั่วไป, the less impurities in the gem, ที่ […]
