WorkVenture gives you an inside look at what it's like to work at Rianbow Mineral & Crystal Co., Ltd., office & team photos, reviews and more. This is the Rianbow Mineral & Crystal Co., Ltd. Company Page. All content is posted anonymously by employees currently or previously working at Rianbow Mineral & Crystal Co., Ltd..Apply to Asia CleanApply to KerryApply to UnitecApply to GMM