They typically include hedge funds, private equity, venture capital, real estate, and real assets, although this investment category is fluid, and new products are constantly being developed. Alternative investments use techniques and instruments that are unavailable in traditional investment approaches.
Pearls are a popular gemstone, especially in jewelry-making. Gemstones. Turquoise, a popular gemstone, is used to make jewelry. Diamonds. Promise rings often feature gems such as amethyst. Quartz is a common type of gemstone. Diamonds are traditionally given as an engagement ring during a marriage proposal.
There are about 20 mineral species that qualify as gem minerals, which constitute about 35 of the most common gemstones. Gem minerals are often present in several varieties, and so one mineral can account for several different gemstones; for example, ruby and sapphire are both corundum, Al 2 O 3. Nomenclature and classification