Ruby (Natural) 2-6mm Graduated Faceted Rondelle - 15-16 Inch focal Viking explorers used thin pieces

Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation

Fluorite is a luminous

These rocks are extremely common and make up a significant portion of Earth's crust

These gauges are often used to display dimensional information in science & engineering but is convenient for creative use as well

often with a golden or brown matrix

Ruby (Natural) 2-6mm Graduated Faceted Rondelle - 15-16 Inch focal Viking explorers used thin piecesRuby is a precious gemstone known for its deep red color. It is a variety of the mineral corundum, the second hardest mineral next to diamond . The presence of chromium is what gives a ruby its red color. Trace amounts of iron can also affect the hue, giving some rubies a slightly brownish or purplish tint. Ruby has long been considered one of the most beautiful and valuable gemstones on the planet. At times in ancient history, Ruby was valued more