Onyx:
Onyx instills a sense of responsibility and hard work, stimulating a thirst for knowledge and need for learning. It prevents you from inconsiderate action, creating a stable environment, shielding you from mistakes. Onyx also helps get rid of toxins from both body and mind.

Calcedonio :
Calcedonio develops the art of diplomacy and negotiation. It is a family stone, and makes a great present for new parents. It will protect you from infidelity, and stengthen your family ties, creating a secure home environment. It stimulates compassion, creating deep, lasting bonds.

Emerald:
Emerald promotes good, fair judgement and calms the mind. It also brings sincerity and develops self-confidence, while creating harmony between thought and feeling.