This page narrows Gem down to Strength only, so the table stays scoped to one subtype instead of the full category list.
Strength listings clear and replenish at whatever pace the in-game market sets; some subtypes trade in volume, others sit static for stretches. The price-history chart on each row's detail page makes that pattern visible at a glance.
Use the search box on the item database home page to jump to a specific item by name, or use the breadcrumb above to step back up to the full Gem category.