18K YELLOW GOLD, STEEL, MULTI-COLOR SAPPHIRE AND DIAMOND TUBOGAS NECKLACE. The term "tubogas" jewelry is named for the Gas Tube as it is similar in appearance. In more recent times, the style has been popularized by Italian jewelers such as Bulgari. This particular necklace is a combination of tubes of 18K yellow gold twisted with tubes of stainless steel. At the bottom, the necklace is adorned with five multi-color oval sapphires each framed by four small round diamonds, a lovely combination of colors and elements.
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