The luxurious Atocha is the company’s latest Japanese-style soaking tub. Measuring 36 inches tall, 68 inches long, and 24 inches wide, the elliptical-shaped product is fabricated from 4-inch copper strips that are welded together, buffed smooth, and polished. It’s made from 90 percent to 95 percent recycled material.  Cost: $23,545. Diamond Spas. 800-951-7727.