The author was referring to the steam holiday gems. They are a new feature (released yesterday) in which a steam user can turn their extra junk cards/backgrounds/emotes into gems.. These gems can be used to buy more cards; or, during the upcoming holiday event only, to bid on games.
Acinar cells. 1  Acinar cells are the exocrine (exo=outward) cells of the pancreas that produce and transport enzymes that are passed into the duodenum where they assist in the digestion of food.
Acinar cell carcinoma. An adenocarcinoma arising from secreting cells of a racemose gland, particularly the salivary glands. Racemose gland: A gland that has the appearance of a bunch of grapes if viewed as a three-dimensional reconstruction; e.g., a compound acinous or alveolar gland.