Garnet
Garnets are a big group of gemstones. Scientifically there are aluminium members and calcium members.
Aluminium members are
1. Almandine garnet
2. Pyrope garnet
3. Spessartine garnet
4. Rhodolite garnet
5. Malaya garnet
Calcium members are
1. Andradite garnet
2. Uvarovite garnet
3. Grossular garnet
To define exactly which variety of garnet the gemstone is takes gemological testing. Most of the time, people use visual inspection to find out i.e Oily inclusions in Hessonite garnet.