Blue Round Tanzanite Sterling Silver 925 Gemstone Stud Earrings - 5 mmA smart pair of round shaped natural blue faceted Tanzanite stud earrings set in a stylish Sterling Silver design. Size of Tanzanite: 5 mm. Gemstone for the month of December. Tanzanite is actually a semi transparent gem stone consisting of shades of purple, violet, red, burgundy and blue. Each side a tanzanite gemstone can transform based on the surroundings and light refraction encompassing it. Tanzanite is called a "stone of magic" that helps with