amethyst is a violet variety of quartz. the name comes from a greek word, a refered to the belief that the stone protected its owner from drunkenness. the ancient greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication.
Citrine is a clear quartz, pale yellow and brownish orange, which is rare in nature. In the past, the color of its sobriety was confused with topaz. Citrine is the best-selling yellow to orange gemstone due to its attractive color, plus durability and affordability. Citrine can be an attractive option not only for topaz, but also for sapphire.
emerald is a gemstone and a type of the mineral beryl colored green by trace amounts of chromium and sometimes vanadium. emerald in antiquity were mined in Egypt at locations on Mount Smaragdus since 1500 BCE.