1/2" (12mm) pewter knot has no beginning or end, symbolizing eternity and infinity in Celtic folk lore. The four simple loops are called a quaternary design, which variously can mean the four seasons, four directions, or the four elements (Earth, Air, Fire, and Water.) 8mm beads are an onyx/marble mixture, ranging from light steel gray with black lines, to dark charcoal. Strung on heavy stretch elastic. 7-1/2" (18cm) long or custom size. Metaphysical properties: Marble -- Balances grounding within our soul. Various chakras, depending on color. Onyx -- Brings forth visions in meditation and dreams. Reduces fever. 1st and 5th chakras. Zodiac birthstone for Leo July 23 - August 22. According to Vedic astrology, the birthstone for February. "Metaphysical properties" should not be taken as medical advice, or used as a substitute for medical care. This product does not claim to diagnose, prevent, or cure health issues. Information given is to explain the lore behind the stones and enrich the buyer experience. Gift-ready in either an organza bag (default) or gift box upon request. Packaging styles change with availability.