is a pyrope/spessartite mixed type as every garnet is almost never pure member of its family.
The general formula is A3B2(SiO4) and hardness of 7. The color are from pinkish-orange ,reddish -orange or yellowish-orange . Found in Tanzania mixed in a rhodolite parcel were these odd colors were rejected and only later has been found that they were a different garnet variety much valuable than rhodolite.
This gem has a yellow- orange color and has some small inclusions, with moderate color change.