Product｜Imperial Jade・Imperial Topaz・Yellow Jade｜Natural yellow topaz is mined from the large topaz veins in West Africa. It is made by directly polishing and turning the original ore without any treatment such as heating or radiation light. This yellow color is the pure yellow color of imperial topaz. Why can't some yellow topaz be considered imperial topaz? Because it depends on whether the color changes under ultraviolet light. Imperial topaz turns from yellow to pink or pink-purple under ultraviolet light. If it is just a topaz with a slightly yellowish brown color, it is generally prepared for processing and color change into other colors such as blue, yellow-brown, or even pink... Imperial topaz is generally interpreted as any yellow topaz including yellow-orange-brown-red... that changes color to pink and purple under UV ultraviolet light. This yellow topaz is extremely precious. It is the most authentic topaz/yellow sapphire. Under the indoor light source, it fully displays the rich golden yellow color of an orthodox emperor. If you can understand the color-causing properties of topaz, you will understand that this type of topaz is hard to come by. Clean｜FL [Flawless means flawless. This gem is called flawless because it refers to the GIA clarity standard for diamonds under 10x magnification. It is applied to this gem to show that even under 10x magnification, no inclusions in the gem can be seen. And if there are small flaws on the surface of the gem, they may only be seen under a microscope] Weight｜1.94 carats. This is an excellent main stone for making rings or necklace pendants. Shape｜9.3 x 6.7 x 5.0mm｜Pear Brilliant Cutting [Pear Brilliant]・Cutting grade: EXCELLENT Color｜Yellow to golden fire, with strong color change under long-wave UV, from yellow to pink and pink-purple