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Engagement ring The One with diamond

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from €399 (-3%)
from €387
incl. VAT
Shipping: 5-7 working days
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Please choose!

Precious metals - the most important criteria 

Yellow gold, white gold and rose gold are available in alloys of 14 carats (58.5% fine gold) and 18 carats (75% fine gold).

All our jewellery is nickel-free! 

White gold (Wg) is a light, white-grey alloy of gold, palladium, and silver. It is particularly popular for engagement rings.

Valuable silver 925/- (sterling silver, Ag) consists of 92.5% pure silver. 7.5% is made up of other metals, such as copper.

Rose gold (Rg) is a pink alloy of fine gold and copper. The higher the copper content, the redder the colour.

Yellow gold (Gg) used for jewellery is an alloy of gold, silver and copper. It is the most popular gold colour in the world.

Platinum 950/- (Pt) is a rare and expensive precious metal. Platinum has a high density, it is particularly durable and robust.

  • 0.15ct (3.4mm) €891
  • 0.25ct (4.1mm) €1,037
  • 0.40ct (4.8mm) €1,419
  • 0.50ct (5.2mm) €1,546
  • 0.60ct (5.3mm) €1,747
  • 0.75ct (5.9mm) €2,045
  • 1.00ct (6.4mm) €3,394
  • 1.25ct (7.0mm) €4,645
  • 1.50ct (7.4mm) €6,953
  • 2.00ct (8.2mm) €13,204
  • 2.50ct (8.7mm) €22,761
  • 3.00ct (9.3mm) €33,629
Please choose!
Please choose!

5 diamond qualities at a glance

Term Description
H/SI Solid entry quality into the world of diamonds
G/SI Recommended quality with excellent properties
G/VS The upper class with even more brilliance
G/IF For connoisseurs, excellent quality
D/IF River: very fine white, flawless and extremely rare

The 4 C's give information about the quality of a diamond. 

1. The colour of the diamonds: in our case D, G oder H  
Diamonds available from us with the colour classification D, G and H appear colourless. 

2. The purity of our diamonds: SI, VS or IF  
SI = Inclusions only visible at 10x magnification, not with the naked eye 
VS = Inclusions difficult to detect even at 10x magnification 
IF = NO inclusions, designation: flawless.  

3. The cut: For our diamonds "very good". 
The quality of the cut ranges from "excellent" and "very good" to "good", "fair" and "poor". With us you always buy diamonds with a cut quality of "very good".

4. The diamond weight 
If all other quality criteria are the same, the following applies: The higher the carat (ct.) weight of a diamond, the more expensive it is.

Learn more about diamonds and diamond quality.

Available with lab-grown diamonds

How to find out the right ring size

In order to determine your partners ring size, we offer two free options:

1. The ring template to print out

Use this PDF you can find out the ring size without having to measure the ring finger. The perfect option if you want to give the ring to someone as a surprise.

2. The ring tape measure

The ring tape measure works like a belt around the finger. Simply send us an email with name and adress. We will send you the ring tape measure free of charge by post within 5 working days.

Changing ring size is free of charge with us

The ring doesn't fit? No problem! We change the ring size for you once, free of charge - including free shipping.

International ringsize table

The international ringsize table helps you find the right size for your ring in our shop. Our size (see: second column) is the inner circumference of the ring in millimetre.

∅ mm Our size EU/FRA ENG USA/CAN JPN
12,7 40 0 C 1.4 (1) 0,2
13,0 41 1 C 1/2 1.8 (1-) 1,1
13,3 42 2 D 1/2 2.2 (2) 2,1
13,7 43 3 E 1/2 2.6 (2-) 3,1
14,0 44 4 F 3.0 (2-) 4,0
14,3 45 5 G 3.4 (3) 5,0
14,6 46 6 G 1/2 3.7 (3-) 5,9
14,9 47 7 H 1/2 4.1 (4) 6,9
15,3 48 8 I 1/2 4.5 (4-) 7,8
15,6 49 9 J 4.9 (4-) 8,8
15,9 50 10 K 5.3 (5) 9,7
16,3 51 11 K 1/2 5.7 (5-) 10,7
16,6 52 12 L 1/2 6.1 (6) 11,6
16,9 53 13 M 1/2 6.4 (6) 12,6
17,2 54 14 N 6.8 (6-) 13,6
17,5 55 15 O 7.2 (7) 14,5
17,8 56 16 P 7.6 (7-) 15,5
18,2 57 17 P 1/2 8.0 (7-) 16,4
18,5 58 18 Q 1/2 8.4 (8) 17,4
18,8 59 19 R 8.7 (8-) 18,3
19,1 60 20 S 9.1 (9) 19,3
19,4 61 21 T 9.5 (9-) 20,2
19,7 62 22 T 1/2 9.9 (9-) 21,2
20,1 63 23 U 1/2 10.3 (10) 22,2
20,4 64 24 V 10.7 (10-) 23,1
20,7 65 25 W 11.0 (11) 24,1
21,0 66 26 X 11.4 (11) 25,0
21,3 67 27 X 1/2 11.8 (11-) 26,0
21,6 68 28 Y 1/2 12.2 (12) 26,9
22,0 69 29 Z 1/2 12.6 (12-) 27,9
22,3 70 30 Z +1 13.0 (12-) 28,8
0/30 Characters
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Engraving
Preview. The appearance of the engraving may vary. We engrave with the most modern laser engraving technique.

Advice for free engraving 

For all the romantics, our free engraving is a great way to dedicate a message to your beloved that will accompany them everywhere.

engraving example – font: Arial

Trend alert: Engraving coordinates

Engraving your first names, with or without date, or a nickname, which often only the partner knows are the most popular engravings.Poetic phrases such as "Forever mine, forever thine, forever ours" or funny things such as "Please say YES!" are often engraved.

engraving example – font: Times

Trend: Engraving cooridnates

We highly recommend engraving the geographical coordinates of your first date. Or your first kiss or the place where you are proposing. The jewellery museum in Pforzheim for example, has the GPS coordinates 48°53'9.622''N 8°41'50.337''E. 

engraving example – cursive handwriting

Free engraving after you propose too!

If you want to propose first, that's no problem. We also engrave your piece of jewellery afterwards free of charge. We also take care of the shipping and return for you!

Extraordinary, enchanting and seductive: The solitaire ring The One perfectly accentuates the diamond.

Our The One engagement ring develops its special look by a combination of the curved surface of the ring band and the clear, contrasting lines that form the almost free-standing frame.

The gorgeous combination of the different shapes makes the diamond raise above the ring band, where it shines bright and sparkling.

Gemstone
Gemstone: natural diamond
Shape: brilliant
Cut grade: very good
Fluorescence: none
Certificate: manufacturer certificate

We deliver stylish & discreet

You will receive a discreet shipping box with a neutral sender, in which a white box is placed. Inside you will find a black velvet ring case (without logo) in which your engagement ring will optimally be protected during shipping.

The heart of our success: our manufactory

We manufacture our engagement rings by hand in the gold town of Pforzheim.

More about the manufactory

FAQs

Frequently asked questions about buying rings. 

Ideally, you should plan to buy it four to six weeks before your proposed proposal. If you’re opting for bespoke designs or have specific requirements, production may take longer. Please feel free to give us a call – we’ll be happy to go through all the options with you. If you’re planning at short notice, we have models available straight away with a short delivery time.

Measure an existing ring discreetly, or ask friends and family for the correct ring size. If the ring still doesn’t fit, we offer all customers free lifetime resizing for all unengraved rings.

Bear in mind your partner’s occupation and lifestyle. Gold, silver and platinum differ in terms of hardness and price. The same applies to diamonds and other gemstones. A flatter setting makes the ring easier to wear at work and whilst playing sport. Please feel free to give us a call; we’ll be happy to help you choose.

Customer ratings
19/07/2026 mmmmm
Beautiful customization of engagement and wedding rings with excellent customer service!
23/09/2024 mmmmm
Very fast delivery and products with outstanding quality!
25/09/2023 mmmmm
Everything was great. I can only recommend them. Great customer service as well.
24/04/2022 mmmmm
Excellent communication from the company and beautiful products.
23/12/2021 mmmmm
Thank you for your perfect service and beautiful ring! It was a pleasure to communicate with you through out the all ...
Authenticity of the reviews
Reasons for our shop
  • Handcrafted engagement rings from our atelier in Pforzheim
  • 10,000 happy couples and an excellent rating of 4.9/5
  • 101-day return guarantee – take your time with the proposal, plus ring resizing for life
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Engagement ring The One with diamond from €387