Available on request – Delivery in 6–8 weeks
- Insured shipping worldwide
- 30 day return period
- Accompanied by an official certificate of authenticity
- Secure and trusted payment options, including iDEAL, credit card and Klarna
- Crafted and certified in line with our standards since 1840
- Carat0.1
- ClaritySmall Inclusions
- ColorTop Wesselton
- CutBrilliant
- Stones20
Diamond Solitaire Ring 0.30 Carat Brilliant Cut 18K White Gold
The Diamond Solitaire Ring 0.30 Carat Brilliant Cut 18K White Gold combines a classic solitaire with refined diamond craftsmanship. This ring is crafted from 18K white gold and set with a brilliant-cut diamond of 0.20 carat at the center, held in a four-prong setting, with 20 smaller brilliant-cut diamonds with a combined weight of 0.10 carat set along both shoulders of the band. The sparkling shoulders lead the eye to the center stone, making this ring a timeless choice as an engagement ring or for everyday wear.
Center diamond
At the center sits one carefully selected brilliant-cut diamond of 0.20 carat, held by four prongs that let in light from all sides.
20 brilliant-cut diamonds on the shoulders
Both shoulders of the band are set with a row of smaller brilliant-cut diamonds, 20 in total with a combined weight of 0.10 carat, adding a line of sparkle that runs halfway around the ring. All diamonds have a Top Wesselton color grade and Small Inclusions clarity, giving them a bright and refined appearance.
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 brilliance of the diamonds and creates a clean, timeless appearance.
Its slim, polished band keeps the focus on the center diamond and makes the ring easy to combine with a wedding band or other fine jewelry.
Specifications
Collection: Royal Coster Diamonds
Product type: Ring
Material: 18K white gold
Number of diamonds: 21
Center diamond weight: 0.20 carat
Shoulder diamonds: 20, 0.10 carat in total
Total diamond weight: 0.30 carat
Diamond color: Top Wesselton
Diamond clarity: Small Inclusions
Diamond cut: Brilliant cut
Setting: Four-prong solitaire with pavé-set shoulders
Ring sizes: 48 to 61
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 diamond ring 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 diamonds 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.




