Looking like Boulder Opals. The famous "Amorphous" sisters, are named after the Crystal System of an Opal.
The two run a Gem and Mineral Jewelry shop in Kolob, though Amorp likes to be out in the field more, mining for their supplies. While Phous is the one who puts the pieces together and runs the shop as it's face.
While they're both single and young, they are much more interested in their works. You can try but probably won't get far with these two!