Diamonds & Gemstones

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Carat

Carat is the unit of weight by which a diamond is measured

Colour

Diamonds are measured on a scale from D to Z. Those at D are colourless

Cut

Cut determines the shape of the stone and how well it reflects light

Clarity

Most diamonds have internal flaws. Clarity refers to the visibility, number and size of these flaws, also known as inclusions

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The Basics

It is necessary to consider each of the 4 C’s when selecting a diamond. All four will affect the price in a different way therefore it is essential to have expert guidance on the best combination to maximise value and make an informed decision.

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Carat Weight

Diamonds are sold by the carat which is equal to exactly 0.2 grams.

Two diamonds of equal carat weight can be very different in value based on the other 3 factors (Cut, Colour, Clarity).

As the carat size of a diamond increases, the diamond’s price per carat increases because the larger the diamond, the rarer it is.

Fewer than one in one million mined rough stones are large enough to produce a finished 1 carat diamond.

So, as carat weight increases, you will typically pay more not only in total but on a price per carat basis as well.

Carat Weight Chart
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Cut

The shape refers to the appearance of the stone, and the cut to the diamond’s ability to reflect light.

Brilliant (Round)are the most popular diamond shape representing approximately 70% of all diamonds sold

Emerald cut stones have a unique shape with step cuts of the pavilion and a large open table

Cushion cut stones combine a square cut with rounded corners which looks much like a pillow

Oval is a modified brilliant cut. They have an elongated shape which creates the illusion of greater size

Heart are a unique and unmistakable symbol of love, popular in solitaire pendants as well as rings

Radiant cuts were the first rectangular cuts to have a complete brilliant-cut facet pattern creating a vibrant and lively diamond

Marquise a football-shaped brilliant cut. Narrow and long, it also creates the illusion of greater size

Princess (Square) cut stones have either 57 or 76 facets with four bevelled sides its pyramidal shape reflects light brilliantly.

Pear cut are a combination of the round and a marquise shape, with a tapered point on one end

Asscher are similar to the emerald cut but in a square shape with larger step facets and a higher crown

The GIA grades Diamond Cut on a scale of Ideal, Excellent, Very Good, Good, Fair and Poor. The Ideal and Excellent grades, depending on Diamond Shape, signify proportions and angles cut for maximum brilliance and fire.

Grades
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Colour

Diamonds come in a variety of colours. Some pink, blue and yellow diamonds command a very high price. In white diamonds however the most valuable are colourless, while a slight yellow tint will decrease the value.

Colour
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Clarity

Clarity is measured on a scale of Flawless to Included. The clarity of a diamond is affected by small surface characteristics called blemishes and by internal characteristics known as inclusions.

Most of these are microscopic and cannot be seen by the untrained and unaided eye. Diamond graders use 10x magnification to determine the clarity.

Clarity
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Lab Grown

One of the most exciting recent developments in the jewellery industry is the rise in popularity of lab grown diamonds. Not only do they allow you to purchase a bigger diamond at a lower price, they’re also a great option for the socially and environmentally conscious consumer who may be looking for a piece of jewellery that’s been made both ethically and sustainably.

Lab grown diamonds are crystals made from carbon and are identical in molecular structure to natural diamonds that we mine from the earth. Physically they are no different than mined diamonds and should not be confused with a diamond simulant such as cubic zirconia or moissanite.

Lab Grown stones are created by using one of two techniques, CVD (Chemical vapour deposition) or HPHT (High Pressure High Temperature). A diamond “seed” is used to grow a full-sized diamond. Laboratories either set the seed in carbon and expose it to high pressure and temperatures (HPHT) or it’s put in a chamber of superheated gas which causes the diamond to replicate and grow (CVD).
Prices are approximately 40% less than mined diamonds. All lab diamonds of 0.30ct and above come certified and inscribed “LG” (Lab Grown) on the girdle for transparency and disclosure.

Coloured Gemstones

We hand select all our coloured gemstones to ensure quality, symmetry, polish and uniformity in colour and light reflection. Sapphires, Emeralds, Rubies and Tourmalines bring a range of colour to our jewellery. However, the durability of your stone may also need to be considered in the case of a ring which is intended to be worn every day.

coloured gemstones

Sapphire

A popular choice for engagement rings, sapphires are very durable and can withstand everyday wear and tear.
Sapphires come in many colours allowing you to expresses your individuality. Of all the tones found in blue sapphires, the Kashmir & Ceylon blue sapphire are amongst the most coveted.
One of the rarest sapphires are the Padparadscha, a delicate balance of orange and pink. Their name translates from Sanskrit as ‘tropical lotus flower’ reflecting their striking colour.
The best sapphires can be found today in Sri Lanka, Myanmar, Madagascar, Thailand, Cambodia, Tanzania, Australia and the United States. The Kashmir region of northern India was once boasted the famous Kashmir ‘blue velvet’ sapphire, but the mine has since been exhausted. Sri Lanka is now where you can find the rarest electric blue “Ceylon” sapphires.

coloured gemstones

Emerald

A natural emerald with its distinctive texture and inclusions makes for an extraordinary engagement ring. However, there are some small risks that come with this stone. An emerald ranks at 7.5 on the Mohs scale. It is softer than a sapphire which ranks at 9 and a diamond which ranks a perfect 10. While still a comparatively hard gemstone, it can falter under everyday wear and tear if not of high enough quality or not set properly.

If you know an emerald is right for you then there are a few things to keep in mind to ensure your gemstone will stand the test of time. An emerald centre stone with a minimal number of inclusions is ideal. The inclusions found in the gemstone give it a distinct look but also contribute to the fragility of the stone. It is therefore important to know that you are buying a quality stone that is robust and beautiful.

Additionally, consider bezel setting for your gemstone. This will give the emerald more protection and decrease the risk of damage to your stone.

coloured gemstones

Ruby

Rubies are part of the corundum family of minerals, scoring 9 on the Mohs hardness scale and are mined in Burma, Thailand, India, Australia, Namibia, Columbia, Scotland and Japan. Sri Lankan rubies have lighter shades and are often called Pink Sapphires. Deeper red shades indicate finer quality, and the best cut is often oval or cushion which enhances colour and vibrancy, giving the stone a densely juicy appearance.

Ruby is the birthstone for July and symbolises the 40th wedding anniversary signifying peace and prosperity. A romantic right-hand ring or a pair of ruby earrings is the perfect choice to celebrate your history as a couple.

Many vintage Art Deco designs feature rubies. The famous “Sunrise Ruby” Cartier ring valued at $30 million is the most expensive coloured gemstone ever sold at auction. It boasts an astonishing 25.59 carat cushion cut Burmese ruby.