How To Identify Crystal Ornaments

Visual Inspection of Key Characteristics
Internal Inclusions: Natural crystals often contain cloud-like wisps, fine internal fractures (ice cracks), or randomly distributed mineral inclusions; ornaments that are flawlessly pure yet inexpensive are likely fakes. Glass or resin imitations often reveal regular, spherical air bubbles, while synthetic crystals appear exceptionally clean, containing only uniform, needle-like inclusions.
Color and Luster: Colored natural crystals (such as amethyst) exhibit natural color gradients and zoning, with a soft, vitreous luster. Imitations often have flat, uniform coloring and either a dull, lifeless sheen or a harsh, unnatural "garish" glare.

Quick Tactile Screening
Temperature/Touch: Natural crystals conduct heat rapidly; they feel distinctly cool to the touch immediately upon contact and retain that coolness even after being held for over 10 seconds. Glass and resin imitations conduct heat poorly; they warm up quickly to body temperature upon contact and feel lukewarm.
Weight and Heft: Natural crystal has a density of approximately 2.65 g/cm³, giving it a substantial, weighty feel in the hand. Resin imitations (such as acrylic) feel noticeably too light, whereas some lead-glass imitations feel unnaturally heavy.