The best of these gems of Mercury Emerald Gemstone Jewelry are a brilliant green, smooth and transparent and without dots or spots. Mercury Emerald attract wealth and give the wearer intelligence and good health. They drive out evil spirits and cure defects of the eyes, regulate blood pressure and nerve ailments. These gemstones improve faculties related to the brain, such as memory, communication, intuition, the intellect, and the ability to learn. However, newly married couples should not wear them as they impair sexual desire. Emerald Gemstone Jewelry was once worn to guard against plague and the bites of venomous reptiles. Tradition had it that the emerald gem jewelery breaks when he or she who wears it is unchaste; even today the belief is that the stone will darken if the spouse if faithless. Apparently, a snake will be blinded if it gazes upon emerald. The gem stone jewellery mercury emerald is best worn when Mercury is in Virgo, or on a Wednesday, on the ring finger of the right hand and weights at least 3 carats.