WoW Forever item sources and crafting uses

Lavishly Jeweled Ring drops from Gilnid in The Deadmines. The two Lesser Arcane Elixirs are different Alchemy recipes: one consumes a Crystal Vial, and the other consumes a Leaded Vial. Open the item, or search for the name, and follow the boss or the recipe from that page.
Where does the ring come from?
Lavishly Jeweled Ring requires level 17 and grants 2 agility and 6 intellect. Gilnid drops it in The Deadmines. The page does not list a drop chance. Gilnid's other listed drop is Smelting Pants. First Mate Band is not on Gilnid. Mr. Smite drops that ring in the same dungeon. Mark both in dungeon loot, then compare them as two finger positions in gear upgrades. A character can plan both.
An item with no acquisition line has no recorded boss or vendor. Empty Vial is one of those: the page lists Alchemy recipes that consume it and does not list a place to find the vial. Its crafting uses are still useful, but confirm a purchase or gathering location in game rather than assuming one.
Which Lesser Arcane Elixir is which?
Lesser Arcane Elixir (Crystal Vial recipe) comes from the Crystal Vial recipe: 1 elixir from 1 Kingsblood, 1 Goldthorn and 1 Crystal Vial. Lesser Arcane Elixir (Leaded Vial recipe) comes from the Leaded Vial recipe: 1 elixir from 4 Kingsblood and 1 Leaded Vial.
Those are different crafts. Kingsblood is shared, at 1 on the Crystal Vial recipe and 4 on the Leaded Vial recipe. Goldthorn is only on the Crystal Vial recipe. Set the recipe you can make. Adding both counts both vials and both Kingsblood totals.
Kingsblood lists every recipe that consumes it, including these two. Start there when the herb is what you have. The page does not show a gathering node for it.
How do you follow the item through the plan?
If it is equipment, read the acquisition line, open the boss, then place it in the equipment comparison when the slot, armor and level fit. Gilnid's ring takes that path: the item, The Deadmines, then the open finger.
If it is a reagent, open each crafting use before you add a craft count. Empty Vial and Kingsblood each touch many recipes. Add only the ones you intend to craft. The materials total multiplies by craft count and subtracts what you own once, which is the worked case in recipes and missing materials.
Search uses the same names as these pages. A result opens the item, recipe, talent or dungeon. Use it when you remember the item or elixir name and not the menu that holds it. Search the dungeon loot page when you remember the boss instead.
What does the page leave out?
These examples show no drop rate, vendor price or skill-up chance, so this page alone cannot estimate farming time or compare market costs. The Crystal Vial elixir and the Leaded Vial elixir stay separate in the plan, in the shopping list and in the link you share. When the acquisition line names a boss, plan that run. When it names nothing, use the recipe list or leave the gap.
Group the bosses in dungeon loot and upgrade runs and compare the rings in gear upgrades.