Very high level background, subject to change based on world-building info from the GM
Wylla was born into a loving family in the western lowland hills of Harrispania. Ages ago, her ancestors had left the Ulflands to the west in front of an invasion of Giants. Among her clan, the tales of woe and horror reinforce why they shouldn't cross back across Rodney Bay. She grew up in a sheltered world, where she wanted for nothing and enjoyed the company of those around her. At a young age, she showed particular skill with her hands and a massive intellect. She was able to see shapes in her mind's eye and turn them into stunning bits of jewelry. Delicate but resilient and with well-cut, but simple, gems. Her work attracted the eye of a travelling gnomish Gemcutter (Gniblish Rockharrow) that had come into the hills seeking a way into the mountains to obtain some gems for his guild (He referred to the group as Ruby's Glint. She's never heard anyone else call it this.). He was a friendly sort, and by the end of his brief repose in their burrow, had offered to take Wylla under his wing and hone her craft as an apprentice Jeweler.
She went away with Gniblish and spent several years learning more advanced techniques from other members of the guild. Finally, she attained the rank of Jeweler (Pristine Grade), and opted to set up permanently in a major city in Harrispania. While in the city, she made a name for herself, as she works hard at perfecting every cut she makes and piece of metal she molds. She detests when people fail to do their very best at anything.
While in the city, she began studying tomes in a library, looking for any knowledge of ancient designs and techniques. Something happened while she was studying, however, and she found her mind opened to the pathways of the arcane. Magic flowed through her blood and she sought training from a local wizard's cabal. Begrudgingly, they allowed her entry. When the time came to worry about her arcane focus, she decided against the more standards wands and staves of her counterparts. Instead, she spent the time and energy to turn her jeweler's hammer into an arcane focus. It was her studies here that showed her the true power of transmutation. She realized the potential to turn chunks of iron into a more malleable silver or easy to carve soft wood. She would then fashion rings and allow the material to revert to its more unmanageable iron state.
She records an interesting array of spells into a leather wrapped tome she affectionately calls her Libra Schema. On the margins of the page there are jeweler doodles and notes about design elements. Scribbled into the pages are the techniques and litanies required to tap into her arcane potential. Her time in the cabal taught her that it's always a good idea for a wizard to have offensive spells and utilitarian spells at their disposal on a given day. She regularly will keep at least a witch bolt or a magic missile prepared every day. Other spells she decides depending on what she's doing. Lots of moving of material in the shop? Tenser's Disk. Out in the wilds gathering materials? Mage armor.