SIERRA Eyeglasses by Blackfin. Color: Antique Dark Blue, Blackfin Black/Shiny Silver, Burgundy Red/Shiny Silver, Light Gold, Obsidian Black Gold, Shiny Silver, Shiny Silver/Deep Blue Rims, Size: 47-21-145. Named after majestic mountain ranges, the SIERRA eyeglasses by Blackfin capture the essence of natural grandeur and translate it into wearable art. These frames are designed for individuals who seek to make a bold yet refined statement with their eyewear. The SIERRA model exemplifies Blackfin's philosophy of creating glasses that are as much about personal expression as they are about vision correction. With these frames, wearers can expect to command attention and project confidence in any setting.