This ring is suitable for Men having ring sizes between 14 to 30 as per Indian ring size standards. This is size adjustable ring and you can easily increase or decrease the size on your own without any harm to the ring. This Navratna ring is made in 92.5 % Pure silver hallmarked by BIS. Hallmarking stamp will be on the ring. 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. The traditional setting and arrangement of these nine gems is done purposefully. A ruby (representing the Sun) is always in the center, surrounded (clockwise from the top) by a diamond or zircon, a natural pearl, red coral, hessonite, a blue sapphire, cats eye, a yellow sapphire, and an emerald.This is the same placement as the Navagraha Yantra.They represent the wisdom of the ancient ones and are highly respected for their strength and individuality. Gemstone certified by a Well reputed laboratory.