At Clogau we use many precious and semi-precious stones in our jewellery. Please note that the majority of gemstones that we use are all natural and not synthetic, therefore there may be slight variations in appearance. This excludes certificated gemstones.

If an item or collection does include treated gemstones we will always specify this information within the items product description.


Birthstone of February

Medieval soldiers wore amethyst amulets as protection in battle in the belief that it healed people and kept them cool-headed.


Birthstone of March

From the Latin meaning ‘water of the sea’, aquamarine brings inner peace, hope and self-love. It is a stone of courage and fortitude that can bring great power.

Blue Sapphire

Birthstone of September

Along with ruby and emerald, blue sapphire is one of the most sought-after and admired gemstones in all of jewellery. It is the third hardest substance on earth after diamond and moissanite and the gemstone of the 5th and 45th anniversaries.

Blue Topaz

Birthstone of December

Blue topaz promotes harmony and relaxation and can be especially helpful in healing hurt feelings and calming frayed nerves.


Birthstone of November

Citrine has energies of good fortune, luck and hope. The name is derived from the colour – the yellow of the lemon.


Birthstone of April

Diamond is said to bond relationships and enhance love. One of the oldest minerals in the world, diamond gives the one who wears or carries it courage and hope.


First discovered at about 1800 by Brazilian naturalist Jose Bonifacio de Andrada e Silva, diopside is thought to bring creativity to the bearer. It is known as a healing stone, related to love, commitment and the inner heart.


Birthstone of May

The emerald is the sacred stone of the goddess Venus. It was thought to preserve love.


Birthstone of January

Garnet contains regeneration and energizing qualities. It is said to increase commitment, honesty, hope and faith and is available in every colour but blue.

Mother of Pearl

Around one in 10,000 oysters collected for mother of pearl contains a natural pearl.


Birthstone of October

Formed many millions of years ago, when a combination of silica and water flowed into cracks and spaces in the ground.


Birthstone of June

Pearls are created within living shelled mollusc. The ideal pearl is perfectly round and smooth.


Birthstone of August

This stone is compassionate and is excellent for healing. Peridot also brings abundance and prosperity.

Pink Sapphire

Gemstone variety of the mineral corundum. Corundum yield a pink or red tint, the latter being called a ruby.

Pink Topaz

The use of topaz goes back to at least ancient Egyptian times and the Sanskrit word for topaz is related to heat or fire.

Preseli Bluestone

The stones used in building Stonehenge 5,000 years ago and are only found in the Preseli Hills in Pembrokeshire, West Wales. They possess healing and magical powers.


Birthstone of July

The red colour is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red.

Rutilated Quartz

Rutilated quartz is transparent rock crystal with inclusions of golden rutile needles in an array of shapes - thick, dense, thin, parallel, criss-crossed and sparse. It is found in many countries such as Australia, Brazil, Kazakhstan, Madagascar, Norway, Pakistan and the United States.


Certain Clogau pieces contain Swarovski genuine gemstones. Cut and polished in Swarovski’s own factories, the most sophisticated technology and advanced research and development are used to maintain the strictest product standards. Each Swarovski Genuine Gemstone is crafted to meet the most stringent criteria of quality, size, shape, and cut, resulting in unmatched brilliance and beauty.


The mineral was named by Tiffany & Co. after Tanzania, the country in which it was discovered in 1967.

White Topaz

Pure topaz is colourless and transparent. White topaz helps you to clarify your thoughts and your intentions.

Yellow Sapphire

Worn throughout the ages for protection, good fortune and spiritual insight, yellow sapphires are not only symbols of power and strength, but also of kindness and wise judgement.