Ring Guidance Diamond Guidance Jewellery Guide

4C'S Of Diamond

The four Cs of diamonds' cut, colour, clarity, and carat determine a diamond’s quality and value. Cut affects brilliance, and an excellent cut can reflect nearly 90% of light. Around 70% of diamonds are sold near-colourless on the D to Z scale. About 80% of diamonds have inclusions not visible to the naked eye. Diamonds over two carats are rare making up only 1-2% of mined stones.

Cut

Cut directly determines how effectively a diamond reflects and refracts light, making it the most important factor in overall brilliance.
Well-cut diamonds can return up to 90-95% of incoming light, resulting in exceptional sparkle and fire.
Poor cut proportions cause light leakage through the sides or bottom, making the diamond appear dull even with higher carat weights.
Precision in symmetry, polish, and angles plays a major role in achieving higher cut grades such as Excellent or Ideal.

Colour

Diamond colour is graded from D (completely colourless) to Z (visible yellow or brown tones) under controlled lighting.
Differences of one or two colour grades are often imperceptible to the naked eye, especially once the diamond is set.
White metals like platinum and white gold highlight colourlessness, while yellow or rose gold can mask warmer tones.
Near-colourless diamonds (G-I) offer strong visual appeal while providing better value than higher colour grades.

Clarity

More than 80% of natural diamonds contain inclusions formed during their creation under extreme pressure.
Clarity is graded under 10x magnification, meaning many inclusions are invisible in everyday wear.
The position, size, and type of inclusions determine whether they affect brilliance or durability.
Eye-clean diamonds balance beauty and value, avoiding the premium cost of flawless grades.

Carat weight

Carat measures weight, not size, with 1 carat equal to 200 milligrams.
A well-cut diamond can appear 10-15% larger than a poorly cut diamond of the same carat weight due to better light return and face-up spread.
Visual size also varies by diamond shape, with elongated cuts often appearing larger on the finger.
Pricing increases at popular carat milestones (such as 0.50ct, 1.00ct, and 2.00ct). Choosing a diamond just below these thresholds (e.g., 0.90-0.95 ct) can save 10-25% with little to no visible difference in size.

Certification & Origin

Diamonds certified by reputable labs (e.g. GIA, IGI, AGS) provide verified grading and assurance of authenticity.
Origin of the diamond can impact ethical considerations and resale value.
Certified diamonds are easier to insure and enhance long-term investment confidence.
Documentation includes detailed information on cut, clarity, colour, carat, and additional quality factors.

Fluorescence & symmetry

Fluorescence is the glow diamonds exhibit under UV light, which can affect appearance and value.
Symmetry refers to the alignment of facets, which influences how light travels through the diamond.
Diamonds with strong symmetry and optimal fluorescence appear more brilliant and balanced.
Both factors are considered during certification and can impact resale value and visual appeal.

Transform Your Existing Jewellery Into Something New

Do you have old jewellery sitting unworn in a drawer? At Robert Cliff Master Jewellers, we specialise in jewellery remodelling and custom jewellery redesign using your existing diamonds, gemstones and gold.

Whether you have an inherited ring, a broken piece of jewellery, an outdated design or sentimental diamonds you would love to wear again, our master jewellers can transform them into a beautiful new custom-made piece designed specifically for you.

Visit our showroom for a complimentary design consultation and discover how your existing jewellery can be reimagined into a stunning engagement ring, wedding ring, pendant, earrings or bespoke heirloom piece.

USE YOUR EXISTING DIAMONDS & GOLD

Bring in your old jewellery, inherited pieces, loose diamonds or unwanted gold and let our expert designers show you what's possible. We can remodel, redesign and handcraft a completely new piece while preserving the sentimental value of your original jewellery.