8mm diameter. 
I clean it before I send it so it shines again.

PHYSICAL HEALING PROPERTIES
Aventurine is known for its healing abilities, which have a particularly positive effect on the heart and the circulatory system. It is often used to promote regeneration and repair and thus contribute to overall health. The stone is also said to promote healthy cell growth and help relieve skin rashes, allergies, and migraines.
EMOTIONAL BALANCE
On an emotional level, aventurine brings calm and balance and helps relieve stress and anxiety states. It is known to promote a positive mindset, strengthen self-confidence, and improve the ability to deal resiliently with difficult situations. The stone also promotes compassion and empathy, thereby enhancing interpersonal relationships.
SPIRITUAL AND METAPHYSICAL VIRTUES
Aventurine is strongly associated with prosperity and happiness and is considered a stone of abundance. It is believed to attract opportunities, foster creativity and innovation, and help realize personal and professional ambitions. In addition, this gemstone stimulates spiritual growth and encourages the individual to embrace change and discover new perspectives.
HARMONIZING THE CHAKRAS
In particular, green aventurine is associated with harmonizing the heart chakra, promotes emotional healing, and enables an opening to the energies of love. It helps dissolve emotional blockages and cultivates feelings of well-being and inner harmony.
ENERGETIC PROTECTION
Aventurine also serves as a shield against negative energies and harmful environmental influences. By creating a sphere of calm around its wearer, it helps maintain a state of peace and serenity even in the most turbulent situations.