What Causes the Red Color of a Ruby?

Rubies have long captivated the hearts of jewelry enthusiasts with their vibrant red hue, symbolizing passion and elegance. But have you ever wondered what gives a ruby its distinctive color? The answer lies in the gemstone's unique chemical composition and the presence of specific trace elements.

At its core, a ruby is a variety of the mineral corundum, which is composed primarily of aluminum oxide. In its pure form, corundum is colorless. However, when trace amounts of chromium replace some of the aluminum atoms in the crystal structure, the magic happens. This substitution causes the gemstone to absorb certain wavelengths of light, particularly those in the yellow-green spectrum, and reflect the red wavelengths, resulting in the rich red color we associate with rubies.

The intensity of a ruby's red hue is directly influenced by the concentration of chromium present. Higher levels of chromium result in a more saturated and vivid red, while lower concentrations may produce lighter pinkish-red shades. This variation means that no two rubies are exactly alike, each possessing its own unique charm.

The Role of Chromium in Ruby's Color

Chromium is the key element responsible for the red coloration in rubies. When chromium atoms are incorporated into the corundum crystal lattice, they create distortions that affect how light interacts with the gemstone. Specifically, chromium absorbs light in the yellow-green region of the visible spectrum. The remaining light, which is predominantly red, is what we perceive, giving the ruby its signature color.

It's fascinating to note that the same mineral, corundum, can produce different gemstones based on the trace elements present. For instance, when corundum contains traces of iron and titanium instead of chromium, it results in blue sapphires. This phenomenon highlights the incredible diversity of gemstones and how subtle changes in composition can lead to a spectrum of colors.

Factors Influencing Ruby's Red Hue

While chromium is the primary determinant of a ruby's color, other factors can influence its appearance:

• Geographical Origin: Rubies from different regions can exhibit variations in hue and saturation. For example, rubies from Myanmar (formerly Burma) are renowned for their deep, vibrant red color, often referred to as "pigeon's blood" red.
• Heat Treatment: Many rubies undergo heat treatment to enhance their color and clarity. This process can intensify the red hue by reducing impurities and improving the overall appearance of the gemstone.
• Presence of Other Trace Elements: Elements such as iron can influence the shade of red. Higher iron content can result in rubies with a more purplish or brownish tint.

Ruby in Jewelry

Rubies are a popular choice for various types of jewelry, including rings, bracelets, and pendants. Their durability, ranking 9 on the Mohs scale of hardness, makes them suitable for everyday wear. Additionally, rubies are the birthstone for July, making them a meaningful gift for those born in that month.

At Robinson's Jewelers, we offer a stunning collection of ruby jewelry that showcases the gemstone's natural beauty. Whether you're looking for a classic ruby ring or a delicate ruby pendant, our selection caters to various styles and preferences.

Caring for Your Ruby Jewelry

To maintain the brilliance of your ruby jewelry, it's essential to care for it properly:

• Cleaning: Use a soft brush and mild soapy water to clean your ruby pieces. Avoid harsh chemicals that can damage the gemstone or the metal setting.
• Storage: Store ruby jewelry separately from other pieces to prevent scratches. Using a soft pouch or a lined jewelry box is ideal.
• Regular Check-ups: Periodically have your ruby jewelry inspected by a professional jeweler to ensure the settings are secure and the gemstone remains in excellent condition.

Understanding the science behind a ruby's red color enhances our appreciation for this exquisite gemstone. Its unique composition and the natural processes that contribute to its hue make each ruby a marvel of nature, perfect for adding a touch of elegance to any jewelry collection.