Gold is the most popular precious metal investment. Investors generally buy gold as a hedge or safe haven against any economic, political, social, or fiat currency crises. The gold market is also subject to speculation as other commodities are, especially with futures contracts and derivatives. The history of the gold standard, the role of gold reserves in central banking, gold's low correlation with other commodity prices, and its pricing in relation to fiat currencies during the financial crisis suggest that gold has features of being money. Gold has been throughout history as money and has been a relative standard for currency equivalents specific to economic regions or countries. The most traditional way of investing in gold is by buying bullion gold bars. In some countries, like Argentina, Austria, Liechtenstein and Switzerland, these can easily be at the major banks. Alternatively, there are bullion dealers that provide the same service. Bars are available in various sizes. For example in Europe, Good Delivery bars are approximately 400 troy ounces. 1 kilogram is also popular, although many other weights exist, such as the 10oz, 1oz, 10 g, 100 g, 1 kg, 1 Tael, and 1 Tola. Bars generally carry lower price premiums than gold bullion coins. However, larger bars carry an increased risk of forgery due to their less stringent parameters for appearance. While bullion coins can be easily, weigh and measure against known values. Most bars cannot, and gold buyers often have bars re-assayed. Larger bars also have a greater volume in which to create a partial forgery using a tungsten-filled cavity, which may not be assay. Efforts to combat gold bar counterfeiting include kinebars, which employ a unique holographic technology and are by the Argor-Heraeus refinery in Switzerland. Gold coins are a common way of owning gold. Bullion coins price according to their fine weight, and a small premium based on supply and demand. The Krugerrand is the most widely held gold bullion coin, with 46,000,000 troy ounces in circulation. Other common gold bullion coins include the Australian Gold Nugget (Kangaroo), Austrian Philharmoniker (Philharmonic), Austrian 100 Corona, Canadian Gold Maple Leaf, Chinese Gold Panda, French Coq d’Or (Golden Rooster), Mexican Gold 50 Peso, British Sovereign, and American Gold Eagle. Coins may be from a variety of dealers both large and small. Fake gold coins occur, and are usually made of gold-plated lead.

Emeralds

Emeralds, like all colored gemstones, are graded using four basic parameters – the four Cs of Gemstones: Color, Cut, Clarity and Crystal. The last C, crystal is a synonym that begins with C for transparency or what gemologists call diaphaneity. Before the 20th century, jewelers used the term water as in a gem of the finest water to express the combination of two qualities, color and crystal. Normally, in the grading of colored gemstones, color is by far the most important criterion. However, in the grading of emerald, crystal considered a close second. Both are necessary conditions. A fine emerald must possess not only a pure verdant green hue as described below, but also a high degree of transparency considered a top gem. In the 1960s, the American jewelry industry changed the definition of emerald to include the green vanadium-bearing beryl as emerald. As a result, vanadium emeralds purchased as emeralds in the United States recognized as such in the UK and Europe. In America, the distinction between traditional emeralds and the new vanadium kind reflected in the use of terms such as Colombian Emerald. Scientifically speaking, color divided into three components: hue, saturation and tone. Yellow and blue, the hues found adjacent to green on the spectral color wheel, are the normal secondary hues found in emerald. Emeralds occur in hues ranging from yellow-green to blue-green. The primary hue must be green. Only gems that are medium to dark in tone considered emerald. Light-toned gems known by the species name, green beryl. In addition, the hue must be bright (vivid). Gray is the normal saturation modifier or mask found in emerald. A grayish green hue is a dull green. Emerald tends to have numerous inclusions and surface breaking fissures. Emerald graded by eye. Thus, if an emerald has no visible inclusions to the eye it considered flawless. Stones that lack surface breaking fissures are extremely rare and therefore almost all emeralds are treated, oiled, to enhance the apparent clarity. Eye-clean stones of a vivid primary green hue with no more than 15% of any secondary hue or combination of a medium-dark tone command the highest prices.6 This relative crystal non-uniformity makes emeralds more likely than other gemstones to be cut into cabochons, rather than faceted shapes.