Assertion: almandine's index | /r/ObjectUse | used for gem
Facets:
value: with 5 or 7-fold symmetries
type: OTHER
Source sentences:
text: Different gem cuts require different index gears, the one below has 96 slots and can cut gems with 3, 4, 6, 8, 12 and 16-fold symmetries (other indices would be used for gems with 5 or 7-fold symmetries).