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Lab Diamond 0.400 carat Solitaire modern Ring in 18k Gold

£899.00 (Incl. VAT)

Certification Type: IGI
Available in 3 colors

SIZE GUIDE

– Know Your Finger Size?

Rose Gold
White Gold
Yellow Gold
Clear
Description

Add subtle sparkle to your jewellery collection with this elegant Lab Diamond 0.400 Carat Solitaire Modern Ring in 18k Gold. Designed with a clean solitaire style and a modern finish, this ring offers refined beauty that feels simple, graceful, and easy to wear.

Crafted in premium 18k gold, this ring features a 0.400 carat lab-grown diamond that brings a delicate shine without being overpowering. The solitaire design keeps the diamond as the main focus, making it perfect for everyday elegance, meaningful gifting, or a minimal engagement ring style.

Lab-grown diamonds offer the same brilliance, fire, and beauty as natural diamonds while being a more modern and responsible choice for fine jewellery. UK Hallmarked, this ring gives you confidence in its quality, authenticity, and lasting value.

💎 Key Features:

Metal: 18k Gold
Diamond Type: Lab-Grown Diamond
Total Carat Weight: 0.400ct
Design: Solitaire modern ring
Style: Minimal, elegant, and timeless
Perfect For: Everyday wear, gifting, engagements, and special occasions
Hallmark: UK Hallmarked

This ring is a beautiful choice for anyone who loves understated diamond sparkle with a modern gold finish. Whether worn as a daily piece or gifted for a meaningful moment, it adds effortless elegance and lasting charm to every jewellery collection.

Additional information
Color

Rose Gold

,

White Gold

,

Yellow Gold
Ring Size

A (11.95 mm)

,

B (12.37 mm)

,

C (12.78 mm)

,

D (13.21 mm)

,

E (13.61 mm)

,

F (14.05 mm)

,

G (14.36 mm)

,

H (14.65 mm)

,

I (15.04 mm)

,

J (15.40 mm)

,

K ( 15.80 mm)

,

L (16.10 mm)

,

M (16.51 mm)

,

N (16.92 mm)

,

O (17.35 mm)

,

P (17.75 mm)

,

Q (18.19 mm)

,

R (18.61 mm)

,

S (19.10 mm)

,

T (19.51 mm)

,

U (20.02 mm)

,

V (20.32 mm)

,

W (20.76 mm)

,

X (21.18 mm)

,

Y (21.49 mm)

,

Z (21.89 mm)
At Roses&Co., we create fine jewellery designed to last a lifetime, combining London-based design with trusted British craftsmanship. Every piece is independently tested and Hallmarked by the London Assay Office, providing a 700-year guarantee of precious metal authenticity. Our diamonds are created using advanced CVD technology, making them chemically, physically, and optically identical to mined diamonds. As a proud member of the Diamond Bourse, we uphold the highest standards of quality, integrity, and industry expertise. The result is exceptional lab-grown diamond jewellery that delivers the brilliance of traditional diamonds with a modern, ethical approach—without compromise.
Every Roses&Co. piece is delivered complimentary across the United Kingdom, ensuring a seamless experience from purchase to arrival. In-stock jewellery is carefully prepared and dispatched within five working days via fully insured, tracked delivery for complete peace of mind. For made-to-order or out-of-stock pieces, please allow three to four weeks for crafting and delivery. Throughout the process, our concierge team provides personal updates, ensuring the same level of care and attention that defines every Roses&Co. creation. Luxury craftsmanship, secure delivery, and exceptional service—at every step.


We want you to be completely delighted with your Roses&Co purchase. We offer a 30-day money-back guarantee from the date you receive your order, giving you the peace of mind to ensure your chosen piece is perfect for you. You have a full month from the moment you sign for your delivery to request an exchange or a full refund, provided the item is in its original, unworn, and pristine condition. To be eligible, please ensure all jewellery is returned in its original packaging with all accompanying documents, including your IGI certificate and proof of purchase. Please note that we are unable to accept returns or exchanges on items that have been resized, engraved, or personalised, as these have been crafted specifically for you; however, this does not affect your statutory rights.

A piece of Rosesco jewellery is designed to be an enduring companion, crafted by our London-based artisans to remain a cherished heirloom for years to come. We stand behind the integrity of our work with a lifetime commitment to quality; in the rare event that a piece reveals a manufacturing defect, we will gladly restore, repair, or replace it to ensure its story continues. Should your jewellery require such attention, all shipping and care will be managed by our studio with our compliments, providing you with seamless assurance for the life of your piece.

The arrival of a Roses&Co. piece is designed to be a sensory experience, where the journey begins with the refined weight and texture of our signature packaging. Your selection is housed within a bespoke, cream-toned vegan leather case—a soft-touch, structured home finished with a subtle gold clasp. To ensure an elevated discovery, each order is presented in a beautifully coordinated gift bag with a hand-tied silk ribbon and dispatched in understated, unbranded outer layers, ensuring your acquisition remains a private, pristine discovery until the moment it is unveiled.

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    Size Guide

    How to Measure Your Ring Size?

    Let’s check out this Chart!

    The following chart will be helpful for you to get the exact size of your ring. You can either make use of a small piece of string/paper or a tape to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on the string. This will be helpful for you to compare with the chart that is mentioned below. For extra width, you can add another size to accommodate.

    Step 1

    Take a thin thread or strip of paper.
    Wrap the thread or paper around your finger.
    Mark the meeting spot of the thread/paper’s end.

    Step 2

    Measure the length of the thread/paper on a scale.
    Use the following chart to determine your ring size.

    UK Size

    Inside Diameter (mm)

    Inside Circumference (mm)

    A

     11.95

     37.54

    B

     12.37

    38.86

    C

    12.78

    40.15

    D

    13.21

    41.50

    E

    13.61

    42.76

    F

    14.05

    44.14

    G

    14.36

    45.11

    H

    14.65

    46.02

    I

    15.04

    47.25

    J

    15.40

    48.38

    K

     15.80

    49.64

    L

    16.10

    50.58

    M

    16.51

    51.87

    N

    16.92

    53.16

    O

    17.35

    54.51

    P

    17.75

    55.76

    Q

    18.19

    57.15

    R

    18.61

    58.47

    S

    19.10

    60.00

    T

    19.51

    61.29

    U

    20.02

    62.89

    V

    20.32

    63.84

    W

    20.76

    65.22

    X

    21.18

    66.54

    Y

    21.49

    67.51

    Z

    21.89

    68.77