A picture of Adelflete can be found here:
http://geocities.com/adambacchusx/adelflete.jpg
She is located in the store "Gems by Kshama." (From your mog, run up the stairs, past the fortune telling taru, it'll be on your left.)
Items Adelflete sells and approximate prices:
Tourmaline 1,863 gil
Sardonyx 1,863 gil
Amethyst 1,863 gil
Amber 1,863 gil
Lapis Lazuli 1,863 gil
Clear Topaz 1,863 gil
Onyx 1,863 gil
Light Opal 1,863 gil
Silver Earring 1,250 gil
Silver Ring 1,250 gil