Preseli Bluestone Obelisk Preseli Bluestone Obelisk Preseli Bluestone, with it's distinct green and grey feldspar markings, is very unique under the circumstances that Preseli Bluestone is normally blue. The photo is typically what you would receive. This is an excellent choice. Preseli Bluestone is a talisman of personal protection and one of the joy of nature. It is a powerful guardian of your loved ones and your physical security. This stone will bring you the blessings and protections from Gaia. measure and weigh approximately - 97 x 34 x 34 mm. Weighs 162 grams. (3.8 x 1.3 x 1.3 inches. Wt: 5.7 ounces.)