Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon 1.50 mm Thick Flat Round Sapphire Crystal (17.0 mm to 23.5 mm) by PERRIN Sale $9.95 | / SKU CR-SPF15-1-17-0 17.0 mm - $9.95 17.5 mm - $9.95 18.0 mm - $9.95 18.5 mm - $9.95 19.0 mm - $9.95 19.5 mm - $9.95 20.0 mm - $9.95 20.5 mm - $9.95 21.0 mm - $9.95 21.5 mm - $9.95 22.0 mm - $9.95 22.5 mm - $9.95 23.0 mm - $9.95 23.5 mm - $9.95 17.0 mm 17.5 mm 18.0 mm 18.5 mm 19.0 mm 19.5 mm 20.0 mm 20.5 mm 21.0 mm 21.5 mm 22.0 mm 22.5 mm 23.0 mm 23.5 mm Diameter (mm) Chevron down icon 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Notify me when back in stock Email address Email me when available This crystals are a scratch resistant crystals for high-end watches. This crystals have a polished top edge.