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Find Your Ring Size

Royal Coster
Diamonds Size
Internal Diameter / Circumference (mm)​
14,01
14,33
14,65
14,97
15,21
15,61
15,92
16,24
16,56
16,88
17,20
17,52
17,83
18,15
18,47
18,79
19,11

How To Measure

The Hands-on Method​ Measure an Existing Ring
  • 1. Grab a tape measure, length of string or strip of paper.
  • 2. 2. Wrap one of these objects around your finger. Mark the place where the two end of the measuring object come together.
  • 3. When using string or paper grab a ruler. Lay it on a flat surface and measure to where the marked point is.
  • 4. Use the chart presented above to acquire the correct ring size.

Engagement Rings Buying Guide

The Perfect Ring

Picking out an engagement ring is an exciting step of your proposal, and it’s also one that many people find daunting. Yet the perfect ring for your partner is always out there and this guide will help you find it.

Ring style

The Style And Setting Of The Engagement Ring’s Band Is Just As Important As The Stone That Will Be Set On It. The Ring Should Reflect Her Personal Style: You May Want To Choose Something That Matches The Jewelry She Already Wears.

It Should Also Suit The Shape Of Her Fingers. As A General Rule, Smaller Rings Are More Appropriate For Younger People, While Larger Rings Look Best On Mature Hands. Rings With Wide, Horizontal Stylings Are Well–Suited To Long, Slender Fingers, While Shorter Fingers Call For More Vertical Designs. An Elongated Ring Can Also Flatter More Generously-Proportioned Hands.

Diamond Shape

Coster Royal 201
The Royal 201 is a diamond cut for which Royal Coster has a patent. This cut has 201 facets and is considered the most sparkling diamond cut in the world.

Round brilliant
The classic diamond cut. This round cut has 57 facets.

Pear
The pear cut has 58 facets and is in the shape of an elegant raindrop or teardrop.

Princess
Princess cut diamonds belong to the square cut diamonds and are the second most popular shape next to round diamonds.

Radiant
A radiant cut diamond has 70 facets. The edges are carefully sharpened and distinctive.

Asscher
The Asscher cut has large flat facets on the top and bottom of the stone. That is why this cut appears almost round.

Marquise
The shape of diamonds with a Marquise cut makes it appear that the wearer's finger is slimmer than normal.

Heart
The heart shape is a romantic and stylish choice that really stands out.

Oval
The traditional oval cut diamond has 58 facets. The facet structure of an oval cut diamond is similar to that of the modern round brilliant cut diamond.

Emerald
The Emerald cut is a great way to show how pure the stone is and what a beautiful color it has. There are no imperfections with this cut, as imperfections are very visible in this reflection within the stone.

The 7 C's

Carat
The weight of a diamond is measured in carats; the bigger a diamond, the rarer.

Clarity
The brighter a diamond is, the more valuable and rare it is.

Cut
A well-cut or faceted diamond sparkles a lot with the light and therefore offers a beautiful shine and a high value.

Color
Diamonds are classified by color, starting at D and going up to Z, with D being the most colorless and thus the most valuable.

Certification
A diamond assessment report is a quality certificate from an independent gemstone laboratory.

Cost
It is important to buy a diamond with the best features. This is best when there is a good mix of the first four C's.

Contour
The shape and size of a diamond play a key role in how a diamond looks in a ring.

Shape & Setting

The Style And Setting Of The Engagement Ring’s Band Is Just As Important As The Stone That Will Be Set On It. The Ring Should Reflect Her Personal Style: You May Want To Choose Something That Matches The Jewelry She Already Wears.

It Should Also Suit The Shape Of Her Fingers. As A General Rule, Smaller Rings Are More Appropriate For Younger People, While Larger Rings Look Best On Mature Hands. Rings With Wide, Horizontal Stylings Are Well-Suited To Long, Slender Fingers, While Shorter Fingers Call For More Vertical Designs. An Elongated Ring Can Also Flatter More Generously-Proportioned Hands.

Setting colour

An Engagement Ring Is Traditionally Made From Gold, Although It Doesn’t Necessarily Need To Be Gold In Colour:

White Gold Is Just As Popular For Its Understated, Elegant Appearance. Rose Gold Is Also Very Attractive And Lends The Ring A Unique Look – Or For An Engagement Ring That Almost Seems To Glow From Within, Consider Platinum.

White (Colourless) Diamonds Are The Traditional Choice For The Stone, But Again You Should Feel Free To Let Your Own Instincts – And Her Style – Influence The Final Decision. Pink Diamonds, Prized For Their Rarity, Make An Exceptional Choice For A Ring With A Difference.

Ring size

While It’s Easy Enough To Have A Ring Adjusted If You Don’t Get It The Right Size The First Time, It Adds A Special Something If Your Intended Can Wear It Right After Your Proposal!

Getting the ring size right is arguably the most important part of putting together the engagement ring. After all, it adds something special if your partner can wear the ring immediately after the proposal.

If you are unsure of your partner's ring size, please contact our sales team. They can give you advice and send you a free ring size by post. You can also take one of her existing rings to a local jeweler to have it checked there. You can also ask a friend or family member if they know what the correct ring size is.

And Finally...
There’s A Lot To Consider When Buying An Engagement Ring – But We Hope This Guide Has Helped You To Arrive At A Decision That You’re Both Happy With.

All That Remains Is For Us To Wish You All The Best Of Luck With Your Proposal!

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