Today it is still the most widely used crystal.
The Crystal Bible by Judy Hall.
Emerald - Stemming from the Greek word "green stone" and also known as the 'Stone of Successful Love', emerald is a stone of the heart chakra. Its soothing energy provides healing of the spirit, inspiration and infinite patience. It embodies unity, compassion and unconditional love.
Black Onyx - Stemming from the Ancients Romans and Ancient Greeks, this is a stone of the base or root chakra, located at the base of the spine. It is a grounding stone and creates a solid connection to the Earth. It emanates the energy of self mastery, self-confidence, independence, focusing and the gift of wise decision making. Onyx is also a separation stone and can be helpful with realizing old habits or relationships that need to be re-evaluated. Brings inner strength, acceptance and moving forward.
Smokey Quartz - Known as the 'Stone of Power'. Stemming from the Ancient Druids, it was sacred and signified the potent power of the earth Gods and Goddesses. This powerful stone lies in its ability to protect and ground oneself physically and spiritually to the world. It absorbs and transmutes significant amounts of negative energy and releases it into the earth to be used neutrally and naturally. It provides healing and protection, relieves tension and stress, anxiety, or panic attacks; also wards off negative thinking, and to eliminate worry and doubt when faced with chaos or confusion.
Black Diamond - Known as the 'King of Gems'. It stimulates and opens all of the chakra's, especially the crown chakra. It symbolizes power, authority and originality. It is believed to help you gain your achievements and to also help reach your goals.
Turquoise - Known as the 'Stone of the Sky', It is one of the old stones in history, dating back as far as 5000 B.C. This is a stone of the kings, shamans and warriors. Prized as a symbol of wisdom, nobility, healing and the power of immortality. It stimulates the throat chakra, making it easier to articulate, empowers the shy and aids creative problem solving.
Blue Sapphire - Known as the 'Gem of Wisdom'. Stemming from the Ancient Medieval world, it is forever associated as the gem of all gems, a jewel of royalty. A stone of learning, healing of the mind, seeker of truth and lending strength and focus. It also provides protection against illnesses such as skin disease, poison and fever.
Salt & Pepper Diamond - Salt and pepper diamonds are not a healing crystal however they are still one of our favorite diamonds. Diamonds come with flaws, imperfections or inclusions though most you cannot see with the naked eye. A Salt and Pepper Diamond is one that has a mix of many black and white inclusions or flaws. For the most part, inclusions are blemishes like white spots, black carbon spots, feathers, cracks, clouds or chips. Basically, salt is a term for white inclusions while pepper is for black inclusions, thus Salt and Pepper Diamonds!