Nature hides an endless treasure of minerals; some of them by its rareness, have become in collectible objects. They are classified by pureness, rarely and color intensity to get graded. By these principles, Hotai series evolves with new special variations. An exploration with semi-precious stones, such as Charoite (Russia), Lapislazuli (Afghanistan), Pyrite (Peru), Rose Quartz (Brazil), among others, look to enhance its characteristics of each stone making transforming them into one-of-a-kind art-objects. The selection of each mineral is a constant challenge because finding the rock in the best quality and size is very hard.