Peridot

Faceting & Design Recommendations

Faceting rough peridot requires careful planning to maximize yield and beauty. Begin by examining each rough stone under good lighting to identify the optimal cutting direction along the crystal's natural axes. Peridot's orthorhombic structure means grain direction matters—cutting parallel to the c-axis typically produces the best color saturation and light performance. Plan your facet angles conservatively. Peridot's moderate hardness (6.5–7 Mohs) means thin or delicate facets are prone to chipping during cutting and polishing. Use sturdy crown and pavilion angles—typically 40–45° for the pavilion and 35–40° for the crown—to ensure the finished stone withstands setting and wear. Brilliant cuts and step-cut designs (emerald, cushion) both work well. Brilliant cuts emphasize sparkle and light return, while step cuts showcase the stone's rich green color and clarity. Avoid overly aggressive cutting angles that create fragile edges. Account for inclusions and natural fractures when planning your design. Work around visible flaws rather than cutting through them, as peridot can be sensitive to internal stress. A slightly smaller, flawless stone is preferable to a larger one with compromised durability. Use diamond or CBN wheels appropriate for silicate minerals. Keep cutting speeds moderate and use adequate coolant to prevent heat stress. Polish with tin oxide or cerium oxide on felt or leather laps, working gradually to avoid thermal shock. Wear proper eye protection and use dust control throughout the process. The finished stone will display peridot's characteristic glassy luster and vibrant green hue when faceted with care and precision.