Color grading chart of Lapis

Lapis lazuli, often simply referred to as lapis, is a gemstone renowned for its rich, deep blue color. This beautiful stone has been treasured for thousands of years, not just for its aesthetic appeal but also for its historical and cultural significance. When evaluating lapis lazuli, color is one of the most crucial factors. In addition to its color, the Mohs hardness of lapis lazuli, which ranges from 5 to 5.5, also plays an important role in its overall value and usage. This blog delves into the color grading chart of lapis lazuli and provides educational insights into its evaluation.

Understanding the Color of Lapis Lazuli

The color of lapis lazuli is primarily due to the presence of the mineral lazurite, which gives it a distinctive blue hue. However, lapis lazuli is not a single mineral but a rock composed of several minerals, including calcite (white), sodalite (blue), and pyrite (metallic yellow). The varying proportions of these minerals affect the overall color and quality of the stone.

The Color Grading Chart of Lapis Lazuli

The color grading of lapis lazuli typically involves assessing its hue, tone, and saturation:

1. Hue: This refers to the basic color of the stone. For lapis lazuli, the desired hue is a deep, intense blue. The presence of greenish or violet tones can reduce the value of the stone.
2. Tone: This describes the lightness or darkness of the color. Lapis lazuli is most valuable when it exhibits a medium to dark tone. Stones that are too light or too dark may be less desirable.
3. Saturation: This measures the intensity of the color. The most prized lapis lazuli has a vivid, saturated blue color without dull or grayish areas.

Based on these factors, lapis lazuli can be classified into several grades:

• Top Grade (AAA): This grade features an intense, deep blue color with a uniform tone and high saturation. It contains minimal to no calcite inclusions and may have small amounts of pyrite, which adds to its beauty.
• High Grade (AA): These stones have a strong blue color with good saturation. They may contain slightly more calcite and pyrite but still maintain a visually appealing appearance.
• Mid Grade (A): Lapis lazuli in this category has a medium to dark blue color but may exhibit more calcite inclusions, making it appear less uniform. The saturation may also be slightly lower.
• Commercial Grade (B): These stones have noticeable calcite inclusions and may show a lighter blue color with lower saturation. They are generally less valuable and often used in less expensive jewelry and decorative items.
• Low Grade (C): Lapis lazuli of this grade has significant calcite and possibly greenish or grayish hues. The color is typically light and lacks the vivid saturation found in higher grades.

Educational Insights: Evaluating Lapis Lazuli

Understanding the color grading chart of lapis lazuli provides several educational insights:

1. Historical Significance: Lapis lazuli has been valued since antiquity. Ancient Egyptians, Mesopotamians, and other civilizations used it for jewelry, amulets, and as a pigment. The deep blue color was associated with royalty and deities.
2. Mineral Composition: The varying proportions of lazurite, calcite, sodalite, and pyrite influence the color and quality of lapis lazuli. High-quality lapis has minimal calcite and a balanced amount of pyrite, enhancing its aesthetic appeal.
3. Hardness and Durability: With a Mohs hardness of 5 to 5.5, lapis lazuli is relatively soft compared to other gemstones. This means it can be scratched by harder materials and requires careful handling. Its moderate hardness makes it suitable for use in less exposed jewelry pieces like earrings and pendants.
4. Caring for Lapis Lazuli: Due to its moderate hardness, lapis lazuli needs to be handled and stored carefully to prevent scratches. Cleaning should be done with a soft, damp cloth, avoiding harsh chemicals and ultrasonic cleaners.

K1556| play | right| “29.74 Ct. Afghanistan No Enhancement Blue Lapis” Lapis lazuli’s rich blue color and historical significance make it a beloved gemstone. The color grading chart helps in understanding the quality and value of different lapis lazuli specimens. By learning about the factors that influence its color and quality, gem enthusiasts and collectors can better appreciate the beauty and uniqueness of this remarkable stone. Additionally, understanding the Mohs hardness of lapis lazuli informs its proper care and usage, ensuring that its beauty is preserved for generations to come.

Ever wondered what defines the quality of Lapis? Discover how the 4Cs Work in Lapis to reveal its true value.