From the French for 'a thousand grains', the tiny beads of a milgrain accent can add complexity and detail to a Onyx design, as well as create a vintage or antique look. A perfect stone for nighttime wear, a black onyx pendant looks elegant and stylish in white or yellow gold. Emerald is associated with Venus, the Greek goddess of love and beauty. They say an emerald pendant can protect lovers from unfaithfulness.