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