Topaz is allochromatic, which means that its colour is caused by impurity elements or defects in its crystal structure rather than by an element of its basic chemical composition.

Citrine - the transparent, pale yellow to brownish orange variety of quartz - is rare in nature. In the days before modern gemmology, its tawny colour caused it to be confused with topaz.

Peridot is the gem variety of the mineral olivine. Its chemical composition includes iron and magnesium, and iron is the cause of its attractive yellowish green colours.

Oval-cut diamonds have an elongated round shape that evokes an understated elegance.

Amethyst is the purple variety of the quartz mineral species.

The princess-cut is a straight sided square or rectangle outline with faceting for optimal light refraction.

Moonstone is a variety of the feldspar group mineral orthoclase.

Baguette cut stones are small, usually rectangular, step-cut diamonds with straight or tapered edges.

Onyx is a type of chalcedony, which is itself a form of microcrystalline quartz.

The Asscher cut is similar to an emerald cut, the Asscher cut's 58 facets are larger and wide-set.

The diamonds cut from the 1920-1940s, are often referred to as transitional-cut.

Fluorescence is the visible light some diamonds emit when they are exposed to invisible ultraviolet (UV) rays.

Channel setting is a distinctive look created when accent stones are set into a grooved channel and laid edge-to-edge in a row. This design protects the gemstones, making this setting style ideal for daily wear.

Tapered baguette cut diamonds have long sides that angle inwards.

A trapeze-cut diamond has four sides, with the bottom sides parallel to each other and the other sides inclined inwards.

A Hexagonal cut diamond is a six sided structure.

A marquise cut diamond features 58 facets and an elliptical shape with pointed ends, made popular in 18th century

Star sapphire is a rare and unique variety of the natural Sapphire gemstone that displays a star-like effect (asterism) on the surface when viewed under a direct light source.