"Mandarin garnet" specimens are the most in demand and the most expensive. Spessartine gem quality stones are rarely larger than 5 to 7 carats in weight. The mineral is also found in Africa ...

The gemstones listed below are the world's most expensive, as per the median price per carat. Black diamonds are a rare and expensive type of stone colored by graphite under intense heat and pressure.

Tsavorite is among the most expensive of all garnets, with prices similar to those fetched by fine demantoid (the other green garnet). But like all gem materials, low-quality pieces may be ...

Our list of the most expensive gemstones has some surprises. Gems and jewelry have always been a staple of wealth and prosperity, probably since the beginnings of mankind. People’s affinity ...

including the occasional semi-precious gemstone, including garnet, quartz, jasper, nephrite, or even sapphire. As the water rinses the stones, their true colors appear — turquoise, sea green ...

The United States hosts a diverse array of expensive gemstones, including agate, diamond, pearl, sapphire, and turquoise. In 2022, the US gemstone industry experienced significant growth.