- DiamondIt may seem surprising that diamond is simply carbon, just like charcoal or graphite. In fact carbon has at least two other rare, and only recently discovered forms, or allotropes, known as fullerenes.
The difference is caused by the different types of bonding between adjacent atoms to form different types of crystalline structure.
- TanzaniteTanzanite is a gemstone which was found in Tanzania in 1967 and is relatively gained very significant popularity and acclaim as a gem.
- TourmalineTourmaline is generally thought of as green, but can be almost any colour, indeed some tourmalines display two or more colours within the same crystal. Because of the naturally occurring shape, tourmalines are often cut as long baguettes, emerald cuts, or ovals. Large size tourmalinesâ€¦
- EmeraldEmerald is the grass green variety of the gemstone called beryl. Beryl occurs in various colours, as follows: Grass green, Emerald, Sea blue, Aquamarine Yellow, Heliodor or Golden Beryl, Pink, Morganite, Colourless, Goshenite, Violet, Beryl, Blue, Beryl, Pale Green, Beryl. Allâ€¦
- RubyRuby is the usual name for transparent red corundum. On this page, we will often use the word corundum to include ruby and sapphire, because of their shared characteristics.
Ruby is red or pink. Blue or any other colour of corundum is usually called sapphire.
- AmethystAmethyst is the clear purple, mauve or violet form of the mineral quartz. As such it is related to citrine which is the yellow form of quartz, and also to rock crystal which is the colourless variety.
- AlexandriteThe important feature of Alexandrite which makes it highly unusual and collectable amongst gemstones is its strong colour change when viewed in different lights. Many other stones show a similar property, but nowhere as strongly, and not with such highly contrasting colours.
- SpinelSpinel is misunderstood by most people. The simple reason for this is that some years ago, synthetic white spinel was used in cheap jewellery, usually eternity rings as a diamond substitute. Although spinel is hard, the synthetic spinels which were used were obviously not veryâ€¦
- SapphireSapphire is the usual name for transparent corundum. On this page, we will often use the word corundum to include sapphire and ruby, because of their shared characteristics.
- Tsavolite GarnetTsavolite, previously called tsavorite, is a bright green variety of grossular garnet, its colour being induced by the presence of chromium. It gets its name from the Tsavo National Park in Tanzania, which is where it was first found. It was only discovered quite recently and hasâ€¦