https://www.amazon.com/Beyond-Forest-Gem-Powers-Book-ebook/dp/B01M6AIPYX
This book is on sale on Amazon for $0.99 (regularly $3.99) 5/9/2018 - 5/31/2018!
Twenty-two-year-old gemologist, Lana Grayson, goes through a portal into the gnome world where gemstones have amazing powers and wonders and dangers await. So begins an adventure that will change her life and theirs as Lana faces the brutal ruler of the gnome world, a being called a woodspirit, who has enslaved and oppressed the gnomes for generations. If you’re an adult who enjoys clean, exciting fantasy novels like many of the classic works written in the 1970s-1990s, this book is for you. Although it’s a standalone novel, Beyond the Forest is book one of the Gem Powers trilogy.
Kirkus reviews praises it as "A bright fantasy for readers who are tired of exaggerated violence and slippery morals." -- Kirkus Reviews.