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Gems come in three types, and they are not interchangeable:
Prismatic changes an item's color. The most sought-after type, with rare shades commanding the highest prices.
Kinetic gives an item an animation of its own.
Ethereal adds a visual effect, most often on a weapon.
Alongside these there are counter gems, which track statistics for a hero or an item.
Rare Prismatic shades lead the market: Rubiline goes for $183, Plague Grey for about $92, Light Green for about $69 and Red for about $58. Kinetic runs far cheaper — Fireborn Assault around $31, Obeisance of the Keeper around $9. Most ordinary gems stay inside a couple of dollars.
Price comes from how rare the shade or the animation is, not from the slot the gem will go into. Among Prismatic the dearest are colors that had a limited run; among Kinetic, animations from older battle passes. Dota 2 items have no float and no wear, so copies differ only by name and price.
Start with what you are changing — color, movement or effect — since that decides the type. Then check that the gem fits the slot: some Prismatic gems do not work on every item. If you are after a particular shade, searching by the color name beats searching by hero.
Sign in through Steam, pick the gem and pay by card or crypto. The bot sends a Steam trade offer; accept it and the gem lands in your inventory. No Steam wallet top-up is needed, and the total is shown up front with no hidden fees.