HC Set: 150 Carat Emerald Rough in Matrix Green Natural Mineral Stone Cab Crystal Rock for Carving - Brazil + One Polished Mahogany Obsidian Cabochon from Peru You will receive exactly this Emerald Rough - 55mm x 32mm x 21mm / 2 3/16 x 1 1/4 x 13/16 Inches; 30g / 1.1 oz / 150 Carat (see photo, some photos are taken wet, stand not included)! These Emerald crystals are natural, unheated, uncut and from Brazil. Emerald, the green variety of Beryl, is the most famous and valuable green gemstone. Its beautiful green color, combined with durability and rarity, make it one of the most expensive gemstones. Deep green is the most desired color in Emeralds. In general the paler the color of an Emerald, the lesser its value. Very pale colored stones are not called Emeralds but rather "Green Beryl". They are sometimes heat treated, which causes their color to turn blue and transform into Aquamarine. Chemical Formula: Be3Al2SiO6; Hardness: 7.5 - 8; Color: Green; Mineral Class: Beryl (Emerald); In additional, you will get one of the Mahogany Obsidian Cabochon similar to the one in the listing, the size and the color of the cabochon may slightly vary as well due to the fact that all minerals are different. Approximately Size: 10-30mm / 7/16-1 3/16 Inches; Approximately Weight: 15-40gr / 0.5-1.4oz. Emerald, sapphire and ruby are considered to be the big three of colored stones. The name emerald derives from Greek "smaragdos" - green stone. It is the most precious stone in the beryl group. Its green is incomparable, and is therefore called "emerald green". Emerald is highly evaluated for its deep bright green colour, transparency and rather high hardness. It has maintained, along with diamond and ruby, the dominant position among gemstones since ancient times. (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.)