When most people hear about diamond luminescence, they think of fluorescence—the blue glow some diamonds show under ultraviolet light. It’s the most talked-about effect, and for good reason, because it can influence appearance, grading, and even market value. However, fluorescence is only one chapter in a much bigger story. Diamonds can react to energy in several fascinating ways, producing light …

Diamonds may be famous for sparkle, rarity, and romance, but in the gem world, appearances can be deceiving. Many stones look almost identical to a diamond at first glance. Cubic zirconia, moissanite, white sapphire, and even glass can mimic the visual appeal of a genuine stone surprisingly well. That’s why gemologists rely on more than the naked eye. One of …

When people examine diamonds, they often focus on sparkle, size, and clarity. Yet beneath that polished surface lies a hidden world of internal characteristics that can affect beauty, durability, and value. Two of the most misunderstood features are graining and strain. They sound similar, and many buyers assume they mean the same thing, but they are quite different.
Think of a …

When you look at a polished diamond, it may seem flawless at first glance. Light dances across the surface, edges appear sharp, and everything looks pristine. Yet beneath that sparkle, most diamonds carry tiny internal features called inclusions. These natural marks act like fingerprints, making each stone unique. Gemologists rely on inclusion plotting to identify, document, and understand these characteristics …

Diamonds often look like simple crystals, but under a microscope and inside a gemological laboratory, they tell complicated stories. One of the most important stories involves treatment history. High Pressure High Temperature treatment, usually called HPHT, can change the appearance of a diamond and improve its market appeal. Because treatment affects value, accurate detection matters for buyers, sellers, insurers, and …

Diamonds may look simple at first glance—clear, brilliant, and timeless—but beneath that sparkle lies a surprisingly complex structure. For gemologists and laboratory professionals, identifying what is happening inside a diamond matters just as much as admiring its beauty on the surface. Natural origin, treatment history, and growth methods can all affect value, rarity, and buyer confidence. That’s where infrared spectroscopy …