Diamonds are graded by their clarity, colour, cut and carat - known as the 4 Cs. Most diamonds are graded and certified by GIA - the Gemmological Institute of America.

All diamonds are sourced from ethical and sustainable suppliers to ensure no exploitation such as child labour and dangerous mines are involved.  I can also supply diamonds which are fully traced from their mines in Canada, each with their own identifying laser mark, serial number and certificate.


The GIA clarity scale has eleven clarity grades ranging from F (Flawless) to I3 (Included 3).  Diamonds are formed under extreme heat and pressure, so it is very rare for a diamond to lack any inclusions.  These natural inclusions and characteristics are used to identify natural diamonds and distinguish them from synthetics and simulants.    
Most diamonds used in our jewellery are very slightly included VS1 and VS2.


The GIA colour scale ranges from D (colourless) to Z (light yellow / brown).  Truly colourless diamonds are very rare.  The colour of a diamond is determined by comparing it to a master set.  Some diamonds also emit fluorescence when exposed to ultra-violet radiation.  This does not affect the colour of the diamond, but the strength and colour of the fluorescence is recorded in GIA reports as it can help to identify them.    Most diamonds used in our jewellery are near colourless G.


The GIA grades the cut of a diamond from excellent to poor. This scale considers the brightness, fire and scintillation of the diamond created by the cut.  A well-cut diamond will achieve total internal reflection (TIR) so that no light escapes the stones and creates optimum brilliance.


1 carat = 2g / 200mg in weight. The use of carat weight started with the carob seed, when early gem traders used the small, uniform seeds as counterweights in their balance scales. Today, the carat is the same milligram weight everywhere in the world.
For diamonds under one carat, each carat is divided into 100 points.  E.g. 0.75ct = 75 points and ¼ ct = 25 points.


I specialise in using beautiful natural gemstones in my jewellery. There is an amazing range of colours and varieties available to make your jewellery even more special.
All of the stones I use are responsibly and ethically sourced and cut by talented lapidaries.
If you are interested in a particular gemstone, please feel free to contact me for more information.
If you are commissioning a special design I can order in a selection of gemstones so you can handpick the perfect stone.
The surface hardness of gemstones is measured by the Mohs scale. This is a scale of 1 to 10, 10 being the hardest.
If you are choosing a gemstone for an engagement ring, I usually advise a stone with a hardness of at least 8, but preferably 9 or 10. Stones with a hardness of 7 or below will soon show scratches from everyday wear, as 7 is the hardness of silica and most grit and dust that will abrade your jewellery.
For a normal ring, the softer stones are fine though – you just have to be a bit more careful with them.

Here are a few examples of common gemstones used in my jewellery and their hardnesses:

6 - 7.  Moonstone, labradorite, opal, peridot, tanzanite, jade

6.5 - 7.5.  Garnet

7.  Peridot, Tourmaline, Quartz - includes amethyst, citrine, agate, carnelian

7.5 - 8. Emerald, aquamarine, spinel.

8.  Topaz, cubic zirconia.

9.  Sapphire, ruby.

10.  Diamond

However, the scale is non-linear. For example, sapphire is two times harder than topaz, and diamond is four times harder than sapphire.
Some gemstones are quite delicate and need a little extra TLC. Some stones have a good surface hardness but are very brittle and chip easily, such as tanzanite and emerald.  The brilliant colours of an opal are created by light refracting through water inside a spherical crystal structure. For this reason, an opal should never be submerged in water, exposed to direct heat or chemicals/cosmetics, as this can cause the opal to go cloudy, dull and even crack. But the amazing colours of an opal are well worth the extra effort!