Rubies found at Sivec Mountain, have been mined for thousands of years. It is a marble mine in the Republic of Macedonia. These aren't on the market regularly, and when they are good with a dramatic color contrast from red to white, they are excellent examples of rubies in matrix. They are highly fluorescent, as shown in the second pic. The color is a richer red under incandescent light. this piece has some slight roughing to the left side, but is overall without damage.