(Un-spotted) Preseli Bluestone Pentacle Pendant

A pentagram is an ancient, powerful symbol formed by a continuous line forming a five-pointed star. It symbolizes harmony, balance, and the five elements (earth, water, fire, air, and spirit/ether). It is often used as a protective amulet, in religious/spiritual contexts (such as Wicca), and in mathematics (golden ratio).
The five points of the pentagram represent the balance between the four classical elements and the spirit. When upright (one point up), it is often seen as a symbol for the human spirit governing the elements.
Pentagram vs. Pentacle:  A pentagram is the star itself, while a pentacle is a pentagram placed within a circle, often symbolizing the unity and infinity of the universe.

(Spotted) Preseli Bluestone is often described as being more focused on grounding, physical strength, and earth energy;  stabilizing, protective, and anchoring.

Unspotted Preseli Bluestone, by contrast, is frequently considered purer and higher-vibrational, associated with spiritual connection, expanded awareness, and subtler energies.