“Diamonds are a girl’s best friend”. Marilyn Monroe said so in Gentlemen Prefer Blondes (1949). But, apart from diamonds, we like a good piece of ruby, sapphire or emerald. These four are our favourite gemstones for a ring. Do you know their features?
Diamonds are extremely rare, with concentrations of at most parts per billion in source rock. Before the 20th century, most diamonds were found in alluvial deposits.
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum. The word ruby comes from ruber, Latin for red. Its quality is determined by its color, cut, and clarity.
Like rubies, sapphires are a variety of gem-quality corundum. They are typically blue, but natural “fancy” sapphires also occur in yellow, purple, orange, and green colors. The only color which sapphire cannot be is red.
Emeralds are cyclosilicates. A fine one must possess not only a pure verdant green hue as described below, but also a high degree of transparency to be considered a top gem.