Under Chelsea Filter (Chelsea filter), Natural lapis lazuli reflects a faint reddish-brown light, while a synthetic lapis lacquer reflects bright red light
Artificial and plastic Stones heat up with a little touch. Wet a cotton ball with acetone and hit the Rock surface. This material dissolves the artificial color in itself. Check the color difference in the cracks of its surface with the magnifying loop. As a destructive test for Azure reconstructed with plastic material, the hot tip of the Metal rod gives off an unpleasant plastic odor. These specimens also sink by pressing under the tooth. Be careful when buying azure that has a uniform color without streaks or spots and is very colorful and looks like artificial colors. With the Chelsea Filter Gemological Tool, you can distinguish original azure from synthetic and laboratory. Under Chelsea Filter (Chelsea filter), Natural Lapis lazuli reflects a faint reddish-brown light, while a synthetic lapis lacquer reflects bright red light.
Tips to remember when buying natural azure!
When there is too much white in the rock, it is classified in the cheap calcite class. When the color of the Stone you want is dark blue-gray, it is probably not lapis lazuli and it is sodalite. They usually Paint low-quality sodalities and sell them as azure! Many imitation lapis lazuli is found in Taiwan. Artificial azure specimens made of golden mottled Glass are not visible but are less common in Gilson synthetic specimens. Physically, natural azure rough has a light blue sand color on the glazed porcelain surface. If it's not too pleasant smell half of sulfur smell.
Obtained a guarantee from the seller that in case of a negative answer, the gemology laboratory will take it back.
