Betelgeuse, a bright star in the constellation of Orion, is much cooler, about 6,900 degrees F, and so even to the naked eye has an easily identified red hue. The brightest star in the night sky, Sirius (also known as the Dog Star), has a surface temperature of about 18,000 degrees F, which gives it its bluish tinge.
At 1109-carat, the Lesedi La Rona is the largest gem-quality rough diamond to be discovered in over a century and the largest Type IIa rough diamond in existence today. Image: Lucara Diamond Corporation. At 118.78 carats, the âThe Graff Venusâ is the worldâs largest D-color, Type IIA, flawless heart-shaped diamond.
Below are the many cuts and shapes that a cutter would be considering from in order to pass on the best value to his customer. Gemstones may come in a variety of shapes, such as round, pear, square, octagon, oval, heart, and triangular, among many others. Each of these shapes may be fashioned into many different cuts, depending on the jewelerâs choice of exposing the gemstoneâs many facets. For example, the square shape may be fashioned into a Princess cut, Radiant cut, Asscher cut and Cushion cut.