These genuine red phantom quartz crystals come from a local, trusted, longtime crystal shop; they are not a matched set, but two very similarly sized and shaped crystals with enough differences to give some visual interest. They are a simple, minimalist, post-against-stone earring, so the stone itself is all you'll see.
 
If you're not into healing crystal lore, but more into geology or just like the look, these are a stone hard to find in jewelry, and have an eye-catching look. The rusty red color is due to iron oxides and hematite within the quartz. I've securely attached a nickel-free post to each crystal, and they are light enough that you won't know you're wearing them.
 
If you are into healing crystals, then the simple post-against-stone minimalism means the stone's energy is touching your skin with nothing between you and them. Red Phantom Quartz's energy is supposed to help with uncovering and clearing old, repressed emotions. It's a Root Chakra stone, and the hematite embedded in the quartz is traditionally used as a protective element against negativity.