At Rudolf Heltzel, we offer expert diamond advice in our Kilkenny jewellery studio, helping you select the right diamond for your engagement ring or fine jewellery piece.
Every diamond is unique. Understanding the key characteristics will help you choose a stone that balances beauty, quality and value.
Why diamonds are so valuable
Diamonds are formed billions of years ago deep within the earth and are the hardest natural material known. Their rarity, durability and ability to reflect light make them the most sought-after gemstone for engagement rings and fine jewellery.
A diamond’s brilliance and fire depend on how it is cut and set. Even stones of the same size can vary significantly in appearance and value.
SHAPES
The 4Cs of Diamonds
The quality of a diamond is defined by four key factors: cut, colour, clarity and carat weight.
CUT
Cut determines how well a diamond reflects light, and is the only diamond characteristic directly influenced by man – the other three are directed by nature. A well-cut diamond reflects light internally and returns it through the top, creating brightness and sparkle. Poorly cut diamonds lose light through the sides or base.
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- • Other shapes: oval, emerald, pear, marquise, princess and heart
- • Round brilliant-cut is the most popular for engagement rings
- • Better cut = more brilliance, regardless of size
COLOUR
Most diamonds appear white but often contain subtle traces of colour.
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- Near colourless diamonds are more valuable
- Completely colourless stones are rare
- “Fancy” diamonds (pink, blue, yellow, green) are exceptionally rare and highly valued
CLARITY
Clarity refers to the presence of natural inclusions formed during the diamond’s creation.
- Fewer inclusions = higher value
- Most inclusions are not visible without 10x magnification
- Many diamonds appear flawless to the naked eye
CARAT-WEIGHT
Carat measures the weight of a diamond.
- 1 carat = 100 points
- 0.50 carat = 50 points
- Larger diamonds are rarer, but value also depends on cut, colour and clarity.
Two diamonds of the same carat weight can differ significantly in price and appearance.
Choosing Your Diamond
The shape and size of your diamond come down to personal preference, while the balance of the 4Cs determines overall quality.
At Rudolf Heltzel, we guide you through this process, helping you select a diamond that suits your engagement ring design and budget.
Diamond Expertise – Kilkenny, Ireland
Visit our Kilkenny jewellery studio for personalised diamond advice. We specialise in engagement rings, wedding rings and handcrafted jewellery, with each diamond carefully selected to complement its setting.
Consultations are recommended for diamond selection and engagement ring design.