how-to-choose-natural-gemstones

5 лет назад

This video explains how to determine the value of a blue sapphire using the "4Cs + OT" method. The speaker analyzes four different blue sapphires, highlighting the importance of color, clarity, carat weight, cut, origin, and treatment level in determining price. The speaker also emphasizes the importance of viewing sapphires in natural sunlight to accurately assess their color.