Ok.Think he or she wear it on a period of Saturn dasa (Antar and Maha).
What type of influence will have that person if saturn is exalted(Uchcha) in that lagna?
Navratna ring is like multivamin. Although there are differences between multivatimin for children, adult, male, female, seniors and so on, Navratna ring has no such variation. Some points to be noted.
1. One can get them set in gold or sliver.
2. All stones are of same size. In case of circular setting, Ruby can be of upto twice weight of other stones.
3. Genune stones must be used:
3.1 Ruby
3.2 Pearl
3.3 Red Coral
3.4 Emrald
3.5 Yellow Sapphire
3.6 Diamond
3.7 Blue Sapphire
3.8 Gomed
3.9 Cat's Eye
4. It must be set in perticular order
5. While wearing, Blue Sapphire should be pointing towards body
6. Somtimes immitations are used. They are not effective.
7. It will provide overall benefit and has no relationship with any Dasa, Mahadasa, Anterdasa or Transit.
8. Just like multivitamin, everyone won't be getting benefit from Navratna.
Due to some precious stones, a good Navratna ring costs in the range of $500 to $2000.