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Gemstone Guide: Facts and Tips

Amethyst facts & tips

AMETHYST GUIDE. Buying tips, facts & history. Amethyst is a purple-violet variety of quartz. Its name comes from the Greek word “amethustos”, meaning “not intoxicated” – the name is a reference to the ancient Greek legend claiming amethysts could pre

Garnet facts & tips

GARNET GUIDE. Buying tips, facts & history. Garnets are formed from many different silicate minerals. Garnet crystals therefore have varied chemical compositions and come in a range of colours. The best known red varieties are Pyrope (orange-red or d

Blue Topaz facts & tips

Blue Topaz facts & tips

Aquamarine facts & tips

The aquamarine derives from the mineral beryl, like emeralds. Its colour varies from pale blue or turquoise to deep blue, depending on the amount of iron present in the crystal. On the Mohs scale of hardness aquamarine rates 7.5 – 8. The word “aquama

Opal facts & tips

Opal is a very special gem, because it is classed as a mineraloid. This means that it doesn’t exist in crystal form. Instead, opals look more like stones that shimmer with incredible displays of colour. For this reason, they are sometimes called “rai

Peridot facts & tips

PERIDOT GUIDE. Buying tips, facts & history. Peridot is a gemstone that displays unique colour. Formed from a silicate mineral called olivine, it contains iron trace elements which give it a distinctive bottle-green pigmentation. Depending on the amo

Ruby facts & tips

Ruby buying tips, facts & history

Pink Sapphire facts & tips

PINK SAPPHIRE GUIDE. Buying tips, facts & history. Sapphire is a precious gemstone formed from a mineral called corundum. Pink is one of the rarest sapphire colours, caused by chromium trace elements inside the corundum crystal. The deeper the pink,

Tanzanite facts & tips

TANZANITE GUIDE. Buying tips, facts & history. Tanzanite is a blue-violet variety of the mineral zoisite. It is named after Tanzania, where it was discovered. It stands out because of its “trichroism”, which means it appears to change colour from blu

Blue Sapphire facts & tips

Sapphire is a precious gemstone, formed from a mineral called corundum. Blue sapphires get their colour from titanium and iron trace elements. On the Mohs scale of mineral hardness, blue sapphire rates 9 out of 10, so it is a very durable gem. The wo

Pearl facts & tips

PEARL GUIDE. Buying tips, facts & history. Pearls are “organic gems” formed inside mollusks, such as oysters, clams or mussels. When a tiny object or grain of sand gets inside a mollusk’s shell, a lustrous substance called nacre begins to form. This

Emerald facts & tips

Emerald buying tips, facts & history