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Customer Care

Diamond Buying Guide

A diamond jewellery piece is likely to be the most expensive jewellery item you'll ever purchase, so it's good to be informed about what you're actually buying. Here's our complete expert guide.

What Are The Four Cs Of a Diamond?

You may have heard the term 'The Four Cs' before but may not be sure what exactly this means. It is a universal term established by the Gemological Institute of America (GIA) to describe the four key characteristics of a diamond.

What Is The Most Important Of The Four Cs?

We think that the most important of the diamond 4Cs is cut. This is because a great cut and polish shows off a diamond's true potential. A diamond with an excellent cut will appear more brilliant and fiery than a poorly cut diamond of greater carat weight or higher clarity.

Heart Cut

Heart Cut

Example of a Heart Cut Diamond

Round Cut

Round Cut

Example of a Round Cut Diamond

Pear Cut

Pear Cut

Example of a Pear Cut Diamond

Oval Cut

Oval Cut

Example of an Oval Cut Diamond

Marquise Cut

Marquise Cut

Example of a Marquise Cut Diamond

Emerald Cut

Emerald Cut

Example of an Emerald Cut Diamond

Princess Cut

Princess Cut

Example of a Princess Cut Diamond

Cushion Cut

Cushion Cut

Example of a Cushion Cut Diamond

Ethical Sourcing

How Do We Source Our Diamonds?

Here at Robert Bicknell, we take ethics very seriously which is why we only use a small list of specific suppliers that we have been working with for a long time, who share our values on ethical sourcing.

Our Founder, Rob chooses every diamond and gemstone himself. Quality is key, even down to the smallest accent stones. We have the utmost confidence in our supply chain and are happy to share the provenance of our pieces with customers.

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How Do We Source Our Diamonds?

Bespoke Diamonds

We Can Source Unique Diamonds For You

If there is something particular you are looking for when it comes to diamonds, the team here at Robert Bicknell can source this for you. Maybe it's a specific coloured diamond or a bespoke cut.

Have you seen a celebrity engagement ring that you're inspired by? We can design something similar, entirely bespoke for you. If a diamond in your existing piece of jewellery has been lost or damaged, we can also replace it with a matching stone.

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We Can Source Unique Diamonds For You

What Are Fancy Coloured Diamonds?

Fancy coloured diamonds are graded on a different scale to white diamonds because their most important factor is always their colour. The most popular fancy coloured diamonds are pink, green, yellow, blue and lilac.

Often fancy coloured diamonds are rare, so there is less availability on the market. But that does not stop us — we hunt high and low to source some of the most exquisite fancy coloured diamonds for our clients.

What Are Fancy Coloured Diamonds?

What to Think About

Considerations When Buying Diamond Jewellery

The diamond market is vast and there are so many sparkly treasures to choose from. Here are the key things to consider before making your purchase.

Need Help Buying Diamond Jewellery?

At Robert Bicknell Fine Jewellery, we are here to help you navigate the world of diamond jewellery with confidence. Our expert team offers personalised guidance, whether you're looking for an engagement ring, a special gift or a treat for yourself.

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Exquisite Service Guaranteed

Our Customer Experiences

At Robert Bicknell Fine Jewellery, exceptional customer care is at the heart of everything we do. We pride ourselves on offering expert guidance and tailored service, all backed by our 5-star Google rating.

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Robert did a magnificent job in repairing and resizing my wedding band and engagement ring which had been tucked away in a drawer for years as I wasn't sure to whose hands I could trust them. I definitely found the right man for the job and I am so pleased with my rings that are like I first wore them 20 years ago. It wasn't an easy repair as platinum can be temperamental but he addressed the repair with great skill and professionalism. I can thoroughly recommend Robert to handle your beloved jewellery.

Henna Boström

Henna Boström

4 months ago

I had such a great experience with Robert. I came to him with one of my mum's favourite rings, which was broken in two places and missing a stone; I did not think it could be fixed, especially as it was quite an unusually constructed and delicate ring. After discussing with Robert, he advised that he could do it. The result was just astonishing, it looked brand new! My mum was so happy to be able to wear her ring again, we are so happy with Roberts work. He was professional, the time estimate on completing the work was accurate, the work was impeccable; cannot recommend him enough. Thank you so much!

Annette F

Annette F

8 months ago

I had an excellent experience with Robert Bicknell Fine Jewellery. Robert enlarged my late grandfather’s dress ring, and the result was amazing. The craftsmanship was flawless — the ring looked fantastic while still preserving all its original character and sentimental value. He also renewed the clasps on two of my gold necklaces and, along with other items I’d left with him, gave them all a thorough clean, bringing back their shine. His professionalism, attention to detail, and genuine care for his work really stood out. I couldn’t be happier with the result. Highly recommend!

Julia Dean

Julia Dean

6 months ago

Had a custom initial chain designed and made by Rob and was absolutely thrilled with the end product. Customer service was amazing and Rob was super accommodating and friendly. He also let me know that I could go back and get an alterations if needed in the future. Would highly recommend and will definitely be back.

Molly Giles

Molly Giles

8 months ago

Rob made my platinum engagement ring mount and it was an impeccable service from start to finish we are so happy with the result. Everyone that works there is so friendly and Rob is amazing at what he does. I highly recommend this business.⭐️⭐️⭐️⭐️⭐️ five stars from us

Jo Mcandrew

Jo Mcandrew

a year ago

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Connect With Our Team

At Robert Bicknell Fine Jewellery, we believe that building a connection with our clients is essential. Located in Chislehurst, our friendly and knowledgeable team is dedicated to providing a warm, approachable experience. Whether you’re seeking advice, inspiration, or personal assistance, we’re here to listen and guide you every step of the way.

Get in touch or visit us in store to discover how we can help you find or create the perfect piece of jewellery.

Call The Workshop Store

020 8467 5862

Call The Chapel Boutique

020 8467 5862

Email us

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Visit The Workshop Store

50 Green Lane, Chislehurst, BR7 6AQ

Visit The Chapel Boutique

The Old Chapel, 4 Queens Passage, Chislehurst, BR7 5AP