"Magic crystals allow us to overcome this issue. Forgemasters and Alchemists both consider a crystal as a beating magical heart in search of a body. The more powerful the gemstone, the greater the number and quality of enchantments it can sustain.
"That is also the reason why Alchemical tools mostly use up to yellow gemstones, because it would be a waste otherwise. Alchemical tools are meant to be cheap and mass produced.
"Using green crystals or above for a single spell would defy everything Alchemy stands for. The cost of the gemstone alone would be enough to buy a better Forgemastered item.
"Embedding a crystal is a delicate and irreversible process in Forgemastering. Once the heart has a body, they become one. If the iron sword of my previous example were embedded with a green crystal, its innate magic would raise to one thousand.