What is a quantity of stones, sometimes of similar size and quality, from a single mine or various sources called?

The term “parcel” is used to describe a quantity of stones that are often of similar size, quality, and origin, typically collected from either a single mine or various sources. This term is particularly relevant in the gemstone trade, where parcels may be sold to jewelers or manufacturers as a cohesive lot. By using the term "parcel," it implies that the stones have been bundled together, often based on shared characteristics, making it easier for buyers to assess quality and value as a whole.

In contrast, the other terms do not specifically convey the notion of stones bundled for sale based on similarity in size and quality. "Batch" might suggest a collection of items produced or handled at the same time, but it lacks the specific connotation related to gemstones. "Collection" often refers to a curated assortment of various stones, possibly differing in type or quality, while "group" is a more general term that does not necessarily imply any similarities among the stones. Thus, the specificity and connotation of "parcel" make it the correct choice in this context.