This Navratna tortoise ring made by 925 sterling silver. About Navratna : Navratna is a Sanskrit compound word meaning "nine gems ". Jewelry created in this style has important cultural significance in Hinduism, Jainism, Buddhism, and Sikhism. This cultured Navratna ring made by 925 sterling silver and cultured stones. The traditional setting and arrangement of these nine gems is shown in the illustration. A ruby (representing the Sun) is always in the center, surrounded (clockwise from the top) by a diamond, a natural pearl, red coral, hessonite, a blue sapphire, cat's eye, a yellow sapphire, and an emerald. This is the same placement as the Nava-graha Yantra. Conception of Tortoise : The turtle as a symbol of good luck representing order, creation, endurance, strength, stability, longevity (average life span 100 yrs) and a gentle innocence.They represent the wisdom of the ancient ones and are highly respected for their strength and individuality.They are said to offer protection,(it has a sturdy shell into which it can retreats for its own protection)good fortune and have the power to bring happiness and good omens. all are different in color.