Herkimer diamonds, a type of transparent quartz, are believed to have metaphysical properties, including healing, increasing spiritual energy, and opening up the crown and third eye chakras. They are known as the "stone of attunement" and are thought to aid in spiritual growth, clearing the mind, and promoting a sense of serenity. 
Here's a more detailed look at their meaning and symbolism:
Attunement and Spiritual Guidance:
Herkimer diamonds are believed to help connect with spiritual guidance and channel celestial energy, making them useful for meditation and spiritual practices. 
Clear Thinking and Clarity:
Their transparency is said to symbolize pure consciousness and clear thinking, undisturbed by surrounding noises. 
Dream Work:
They are often used to help those looking to experience astral travel or have lucid dreams. 
Protection:
Herkimer diamonds are thought to protect the owner from mental and physical harm, making them a popular choice for amulets. 
Chakra Alignment:
They are associated with the crown and third eye chakras, which are believed to promote higher levels of consciousness and intuition. 
Manifestation:
Herkimer diamonds are also widely recognized for their manifestation properties. 
Herkimer diamonds are a popular choice for those seeking to deepen their spiritual practice, enhance their intuition, and promote clear thinking and mental clarity.