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Find Your Ring Size

Royal Coster
Diamonds Size
MM / INCH (Circumference)
48 / 1.89 48 4½ 8
49 / 1.93 49 9
50 / 1.97 50 K 10
51 / 2.01 51 L 11
52 / 2.05 52 6 12
53 / 2.09 53 13
54 / 2.13 54 14
55 / 2.17 55 O 15
56 / 2.20 56 P 16
57 / 2.24 57 8 17
58 / 2.28 58 18
59 / 2.31 59 R 19
60 / 2.36 60 9 S 20

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Canals Collection

To honor the city we love so much we've used the shape of the canals grid as an inspiration to create a new diamond cut.

Luna Collection

Inspired by the moon, the design of the Luna Collection will shine even brighter than you can imagine.

Tennis Collection

Elevate your style and radiate timeless elegance with our fine diamond Tennis Collection

Rainbow Collection

All the colors of the rainbow form the fundament of our unique Rainbow Collection.

Signature C Collection

Born out of love for the craft, the Royal 201 is the star in every scene.

Coster Classics collection

Sparkling diamonds in combination with a subtle look creates the bestselling classic.