Royal Coster
Diamonds Size

MM / INCH (Circumference)

48 / 1.89

49 / 1.93

50 / 1.97

51 / 2.01

52 / 2.05

53 / 2.09

54 / 2.13

55 / 2.17

56 / 2.20

57 / 2.24

58 / 2.28

59 / 2.31

60 / 2.36

Discover your ring size

Measure an existing ring

Measure your finger

1. Download the pdf document below, set it to 100% and print it on A4 paper. You can measure the 5cm line to check the accuracy of the printed dimensions.

2. Check which circle matches the size of your ring. Make sure that the black circle is only visible within the ring.

3. If the ring is in between two circles (sizes), we recommend the larger size.

1. Download the pdf document below, set it to 100% and print it on A4 paper. You can measure the 5cm line to check the accuracy of the printed dimensions. Then, cut out the Finger Sizer.

2. Cut the small gold line. Wrap the sizer around the largest part of your finger and make sure it is tightened.

3. Read your ring size from the sizer. If your ring size is in between two circles (sizes), we recommend the larger size.

Breakfast at Coster

Nov 11, 2020

This year, Royal Coster Diamonds celebrates its 180th anniversary. But there is an extra reason for a party. Exactly 50 years ago we settled on Paulus Potterstraat 2, on the Museum Square in Amsterdam. That is why we organize something unique from 1 July 2020, especially for you. We introduce: Breakfast at Coster.

Breakfast at Coster

Breakfast at Coster is an initiative in which we invite you for a special experience at Royal Coster Diamonds. Here you can sign up for a champagne breakfast, lunch, or high tea. In addition to this breakfast, this lunch or high tea, you receive a private tour of Royal Coster Diamonds; the oldest diamond polishing factory in the world. You learn from our diamond experts how to distinguish a real diamond from an imitation. Above all, you leave with a nice goodie bag.

Due to the quantity and freshness of the products, it is necessary to reserve at least one (working) day in advance. You can indicate how many people you come with and whether you have certain allergies and/or dietary requirements. Due to the current corona measures, there is only limited availability. We, therefore, recommend that you book as soon as possible. There are three options:

Breakfast (9:30 AM)
Lunch (12:30 PM)
High Tea (2:30 PM)

Highlights

Enjoy a breakfast, sandwich lunch or high tea
Personal explanation about diamond polishing & the 4C's
Learn the differences between a real diamond and an imitation
Learn about the diamond history of Amsterdam
See loose diamonds in all shapes and sizes
See our Royal 201 patented collection

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Breakfast at Coster

Highlights

Featured collections

Royal 201 Signature C Collection

Luna Collection

Rainbow Collection

Tennis Collection

All Watches

Availability

Royal Coster Diamonds Size	MM / INCH (Circumference)
	48 / 1.89	48 4½ I½ 8
	49 / 1.93	49 4¾ J¾ 9
	50 / 1.97	50 5½ K 10
	51 / 2.01	51 5¾ L 11
	52 / 2.05	52 6 L½ 12
	53 / 2.09	53 6¼ M½ 13
	54 / 2.13	54 6¾ N½ 14
	55 / 2.17	55 7¼ O 15
	56 / 2.20	56 7½ P 16
	57 / 2.24	57 8 P½ 17
	58 / 2.28	58 8¼ Q½ 18
	59 / 2.31	59 8¾ R 19
	60 / 2.36	60 9 S 20

Discover your ring size
Measure an existing ring	Measure your finger
1. Download the pdf document below, set it to 100% and print it on A4 paper. You can measure the 5cm line to check the accuracy of the printed dimensions. 2. Check which circle matches the size of your ring. Make sure that the black circle is only visible within the ring. 3. If the ring is in between two circles (sizes), we recommend the larger size.
1. Download the pdf document below, set it to 100% and print it on A4 paper. You can measure the 5cm line to check the accuracy of the printed dimensions. Then, cut out the Finger Sizer. 2. Cut the small gold line. Wrap the sizer around the largest part of your finger and make sure it is tightened. 3. Read your ring size from the sizer. If your ring size is in between two circles (sizes), we recommend the larger size.

Your cart

Your cart is empty

Find Your Ring Size

Discover your ring size

Still not sure about your size?

Your Enquiry

Your Enquiry

DROP A HINT

Sender

Recipient

Highlights

Featured collections

Royal 201 Signature C Collection

Luna Collection

Rainbow Collection

Tennis Collection

All Watches

Receive a Complimentary Goodie Bag