Refraction Index: 1.50-1.55 Hardness: 5-6 Specific Gravity: 2.38-3.00 Treatment: None, polished with paraffin wax Care: Wash with mild soap and water. Never steam or ultrasonically clean. Traditional birthstone: December Wedding anniversary gemstone: Seventh and Ninth. Planetary stone: Capricorn Zodiac stone: Libra.
Lapis was one of the first stones to be used in jewelry