Oracle Body Jewelry Yellow Gold sunstone Threadless End

Oracle Body Jewelry handmade threadless end Gold pin, single end Measures roughly 9mmx7mm The sunstone is primarily orange with hues of pink and lots of sparkles in the light. See picture with flash. PLEASE NOTE: see the last picture for discoloration of the backing. I am not an expert on why this occurred or how or if it can be cleaned and I myself bought this piece used so this piece is rather old, I am hesitant to use any harsh gold cleaners given the oregon sunstone on the front. Tags for exposure: bvla, pupil hall, anatometal