: Inclusions are common in natural stones and often serve as "fingerprints" of authenticity. Some stones, like emeralds, are expected to have inclusions, while others like aquamarine are typically "eye-clean".

: A good cut enhances color and brilliance. Avoid "windowing" (where light passes straight through the center, making it look dull) or uneven pavilions that hide weight without adding beauty.

: Gemstones are sold by weight (carats), but physical size (millimeters) is more important for jewelry settings. Note that stones with different densities will have different physical sizes even if they share the same carat weight. 2. Durability and Wearability

Buying stones for jewelry requires a balance of aesthetic appreciation, technical knowledge, and commercial savvy. Whether you are a hobbyist or a professional jeweler, the following sections detail the critical factors involved in selecting, verifying, and purchasing gemstones. 1. The Core Quality Framework (The 4Cs of Colored Stones)

: Evaluated by hue (the color itself), tone (lightness or darkness), and saturation (intensity). Vibrant, highly saturated stones typically command the highest prices.