IBasket

Returned by BasketApi — a prong basket under one mother gem. Adds to IGemSetting:

Member	Meaning
ProngCount	Number of prongs
ProngHeight	Prong height, mm
ProngDiameterTop	Prong diameter at the top, mm
ProngDiameterGirdle	Prong diameter at the girdle, mm
ProngDiameterBottom	Prong diameter at the bottom, mm
SetProngCount(prongs)	Rebuild with this many prongs — negative counts follow the tool’s rotated-variant convention
SetProngDiameter(diameter)	Prong diameter, mm
SetProngHeight(height)	Prong height, mm

Each setter regenerates the basket: the group keeps its id, so the handle stays valid; the member objects are rebuilt.