Our Semi Precious Stones are genuine and natural unless otherwise stated in their description. The vast majority of Semi Precious Stones are treated in some way, as they would not be stable enough for use in jewellery in their original state. Treatments for Semi Precious Stones throughout the industry include Heat (to intensify colour and inclusions), Dye (to change/intensify colour) and Stabilization (to solidify the stone for cutting, drilling and polishing). Please note that these processes are often essential before a stone is manipulated into the unnatural shapes (spheres, hearts etc.) consumers wish to purchase. Although most of our Semi Precious stones are not A grade and many will have been treated in some way, they are however excellent quality and great value for money.