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Lemon Test - The lemon test is to determine the ability of your granite to resist etching. Follow the steps below: 1  Place a wedge of lemon or lime, cut side down, on the sample overnight. 2  Wipe the sample in the morning and hold it at an angle to the light.  Check for a rough spot where the lemon was placed.
Lemon quartz is the lemon yellow variety of quartz. It is more lemon in color than a citrine, which has tones of orange in it. Citrine and Amethyst are both in the quartz family of gemstones. Some people mistakenly call prasiolite lemon quartz -- prasiolite has a green tone in it, and is also called green amethyst. It is also known as green gold or lemon citrine.