HC Set: 3.1" Red Mahogany Obsidian 12 Point Merkaba Star Natural Mineral Stunning Crystal Hand Made Stone Star - Mexico + One Polished Clear Quartz Cabochon You will get exactly this Red Mahogany Obsidian 12 Point Star - 79mm x 78mm / 3 1/8 x 3 1/16 Inches; 40g / 1.4 oz (see photo, the photos are taken under bright light, the last photo is taken on the mirror surface)! The dimensions of the star are given based on the maximum distance between two adjoining tops of the star. In additional, you will get one of the Clear Quartz Cabochon similar to the one in the listing. Size: 31 x 21 x 16mm / 1 1/4 x 13/16 x 5/8 Inches; Weight: 12-22gr / 0.4-0.8 oz. Obsidian was so named from its resemblance to a stone found in Ethiopia by Obsius. Rainbow Obsidian is black obsidian that, when polished and exposed to a strong light, shows bands of rainbow colors. Rainbow obsidian is said to be the stone used by Nostradamus to foresee future events. Obsidian is formed when volcanic lava cools very quickly. Obsidian is a natural form of volcanic glass , composed of various combinations of basalt, Andesite, Rhyolite, and Trachyte. Basic colours range from smoky gray to red or reddish brown, blue and black. Obsidian comes in a number of colours and patterns including banded, mahogany (includes streaks of mahogany coloured bands), rainbow or peacock (contains layers of iridescent colours) and sheen (colours such as gold, silver or blue sheen seen in certain lights). Mahogany Obsidian is a rich brown colour with black spots. Mahogany Obsidian is found anywhere volcanic or where volcanic activity has occurred. Some of the places it comes from today are Japan, South America, Afghanistan, Mexico, and parts of the United States. In the San Carlos Apache Reservation in Arizona, United States, a particular variety of Mahogany Obsidian called Apache Tears is produced. Hardness: 6-Hardness; Color: Black and Brown. (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)