Answer
The pieces were described during the visit as gathered from five regions of the Kingdom. They were not extracted from protected geological sites; a number were instead identified among ordinary stone and gravel circulating at fill-and-aggregate yards, where they were treated as common rock because their value went unrecognised. They were acquired through available channels and saved from being crushed. This story exposes a real knowledge gap, and it also calls for documenting a chain of custody for every piece: acquisition source, date, attributed region, and specialist review.