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- 30 day return period
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- Crafted and certified in line with our standards since 1840
- Carat0.55
- ColorTourmaline
- Stones1
Tourmaline Solitaire Ring 0.55 Carat 18K White Gold
The Tourmaline Solitaire Ring 0.55 Carat 18K White Gold combines natural color with refined craftsmanship. This ring is crafted from 18K white gold and set with a single tourmaline of 0.55 carat, held in a prong setting at the center of a sculptural, open bypass band. The warm green tones of the tourmaline against the cool white gold give the ring a distinctive, contemporary look, making it a timeless choice for everyday wear or as a special gift.
Tourmaline
At the heart of the ring sits a single tourmaline of 0.55 carat, held in a prong setting that lets in light from all sides. Its natural green color, with subtle shifts of tone, forms the focal point of the design.
18K white gold
The ring is crafted from 18K white gold, giving the metal a cool and luxurious shine. The bright white-gold tone beautifully complements the color of the tourmaline and creates a clean, modern appearance.
Its polished band curves around the stone in a flowing, open design and makes the ring comfortable to wear every day and easy to combine with other fine jewelry.
Specifications
Collection: Royal Coster Diamonds
Product type: Ring
Material: 18K white gold
Number of tourmalines: 1
Tourmaline weight: 0.55 carat
Total gemstone weight: 0.55 carat
Setting: Prong-set, open bypass design
Ring sizes: 47 to 62
Royal Coster Diamonds
Royal Coster Diamonds is the oldest still-operating diamond polishing house in the world and has been based in Amsterdam since 1840. Each piece is carefully inspected, securely packaged, and insured during shipment.
In addition, we offer a lifelong cleaning service to help preserve the shine of your ring and tourmaline over time.

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The 4C's
The 4C's of a diamond are the four key characteristics that determine the quality and value of a diamond: cut, carat weight, color, and clarity. Together, these four characteristics are used to evaluate the quality and value of a diamond, and are considered when determining a diamond's price.
Carat
The weight of a diamond is expressed in carats and points (1 ct = 100pt). ‘Carats’ come from ‘Carob’ seeds, which were originally used for their constant weight in nature (1 ct = 0.2 g). The carat and the color are the factors that influence the most the final price of the diamond.
Clarity
The clarity is a gemstone's relative freedom from internal imperfections. These imperfections are observed with a x10 magnifier ('loupe') and affect the final value of the diamond differently.
Color
Diamonds are found in nature in different colors. White diamonds can be more or less yellow and are categorised with a letter between D (commonly known as ‘River’) to Z . The different naming systems vary depending on the certifier. Diamonds are also found in all colors; the rarest colors are classified as Fancy-colored diamonds.
Cut
The cut is the diamond’s shape. A cut grade describes the proportions of the cut and the quality of its symmetry and polish. A perfect cut makes the best sparkle.




