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The first step in choosing replacement crystals is to determine the grade of crystal you’d like to purchase. A crystal’s quality is graded by determining its’ lead oxide content. The lowest grade, crystalline, is glass with six to ten lead oxide content. The mid-grade glass, called half lead, must contain twenty-four to thirty percent lead oxide. Top grade glass, or full lead glass, constitutes a lead oxide content of over thirty percent. Higher amounts of lead oxide equate to more light refraction, making higher-grade crystals more adept at producing the telltale shimmer. Many different crystal types exist, with Strass, Turkish,...