I've been a certified literary braille transcriber since 2010. All my braille pieces are correctly sized and spaced, and done in Grade 2 literary braille. This means it's contracted, and is not simply letters translated into bumps.
As a sighted artist, I think it's imperative that if I am going to include braille in my designs, it be accurate and functional for tactile readers. Braille is beautiful to both touch and sight, and I enjoy getting to highlight it in my work. I hope my customers who use or are familiar with braille will enjoy having a correct, functional piece, and those that are new to braille enjoy understanding it better.
Grade 2 braille uses contractions, meaning certain letter combinations or even words have their own combination of braille dots within a cell. Further, the same braille cell pattern can have a different meaning depending on where in a word it falls. For example, one symbol is simultaneously the prefix "dis-", the letters "dd" and a period, depending on whether it falls at the beginning, middle, or end of a word, respectively.
I love that cleverness, and the way braille focuses on saving space when having a limited number of 6-dot combinations available to it. It also makes it feel a little magical - half secret code to those not in the know. I love having a physical touchstone for a favorite quote or word, and keeping it with me without necessarily broadcasting the meaning widely.
Most of the stones I use are lab-grown. These are chemically the same as mined stones, but the process is better both for the environment and for the workers involved. And honestly, it's a neat combination of nature and science that makes my geeky heart beat faster. (Fellow science nerds: I recommend googling "Verneuil process" and "Czochralski method". Cool stuff.) And, bonus, they tend to be less expensive. It's wins all around, in my book.
There are exceptions where I use mined stones in my work (mostly opals), but my gems will be labeled as mined or lab-grown in their listings.