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Since landing in Manhattan in 2000, Niwaka, the Tiffany of Japan, has developed a loyal following. Its rings are the ultimate symbol of femininity, elegance, and prestige. The sleek designs come in white, pink, or yellow gold or platinum, and you can even design your own. Prices begin at $300 for a simple yellow-gold band and top out at $15,000 for a one-carat diamond engagement ring with platinum setting.