A Navaratna (also spelled Navaratna or Navagraha) refers to a piece of jewelry, typically a ring, bracelet, or pendant, that contains nine gemstones representing the nine celestial bodies or planets in Hindu astrology. Here are the features and significance of a Navaratna jewelry piece:

1. Nine Gemstones: The Navaratna jewelry features nine specific gemstones that represent the following celestial bodies:
   a. Ruby (Sun)
   b. Pearl (Moon)
   c. Red Coral (Mars)
   d. Emerald (Mercury)
   e. Yellow Sapphire (Jupiter)
   f. Diamond (Venus)
   g. Blue Sapphire (Saturn)
   h. Hessonite Garnet (Rahu)
   i. Cat's Eye Chrysoberyl (Ketu)

2. Astrological Significance: Each gemstone in the Navaratna jewelry is associated with a particular planet, and it is believed that wearing these gemstones brings the beneficial energies and influences of the respective celestial bodies into one's life. It is believed to balance the planetary influences and promote overall well-being.

3. Combination and Placement: The gemstones in a Navaratna piece are carefully selected and arranged according to specific astrological guidelines. The arrangement can vary, but it typically follows a specific pattern or design, with the ruby usually placed in the center, surrounded by the other gemstones.

4. Energies and Powers: Navaratna jewelry is believed to possess the combined energies and powers of all the gemstones it contains. It is said to bring good luck, prosperity, protection, and harmony to the wearer.

5. Customization: Navaratna jewelry can be customized to suit individual astrological charts or personal preferences. The gemstones can be set in various precious metals like gold, silver, or platinum, and the design can be tailored to create a unique piece of jewelry.

6. Symbolic Representation: In addition to their astrological significance, the gemstones in a Navaratna jewelry piece are also believed to represent certain qualities and attributes. For example, the ruby symbolizes courage and leadership, the pearl represents purity and emotional balance, and the yellow sapphire signifies wisdom and prosperity.

7. Spiritual and Healing Properties: Navaratna jewelry is believed to have spiritual and healing properties. It is thought to enhance one's aura, balance the chakras, and promote physical, emotional, and spiritual well-being.

Navaratna jewelry is highly regarded in Hindu astrology and is often worn as a talisman or for its aesthetic appeal. However, it's important to consult with a knowledgeable astrologer or gemologist to ensure that the gemstones are suitable for your specific astrological chart and needs before wearing Navaratna jewelry.