CRYSTAL RIVER Eyeglasses by Blackfin. Color: Brown/Gold, Brown/Magenta, Blue/Turquoise, Blue/Red, Silver/Pink, Size: 50-18-145. The Blackfin CRYSTAL RIVER captures attention with its impactful end pieces and fluid lines. The silhouette is a dance of elegance and strength, effortlessly blending delicate curves with pronounced accents. These eyeglasses are made for those who seek both comfort and a striking visual statement. The CRYSTAL RIVER is sure to add a touch of refined boldness to your eyewear collection.