NEW YORK ( TheStreet) -- One of the big stories this week was the Christie's Auction which saw a 44-year old painting, "Lucien Freud" by Francis Bacon, sell for $142 million, and a sculpture meant to look like a children's birthday party animal, Balloon Dog by Jeff Koons, sell for $58 million.Also drawing attention were diamond sales. A 14-carat orange diamond sold at Christies for $36 million. And in Geneva, Switzerland a 59-carat pink star diamond sold for $83 million dollars. One of the many criticisms of the U.S. Federal Reserve Bank's zero-interest rate and quantitative easing policies is that it disproportionally benefits the wealthiest among us by squeezing asset prices higher -- further widening the wealth gap as the so called 1% obviously own most of the assets. As one of many measures of the growing wealth gap, CEO pay between 1978 and 2011 increased by 725% while worker pay increased by 5.7%, according to the Economic Policy Institute. A wide wealth gap is generally accepted as being a contributing factor to the Great Depression. Today, the wealth gap is wider than it was back then with the top 1% of the population estimated to own 40% of the country's wealth, according to ThinkProgress.org. Another sign of excess could be the rumored $3 billion that Facebook ( FB) offered to Snapchat, a company with reportedly no revenue. There have been funds over the years that have come and gone, including the old Claymore Robb Report Global Luxury Index ETF, and there have also been funds that invest in art that have tried to capture this theme. For now the easiest way to try to capture these signs of excess is the PureFunds ISE Diamond/Gemstone ETF ( GEMS). GEMS owns companies involved with the gemstone business including retailer Signet Jewelers ( SIG) and Petra Diamonds Limited ( PDMDF)which has mining operations in Africa, but whose stock is traded primarily in London. As a global fund, the U.S. is the largest country at 28%, followed by Hong Kong at 25% and Canada at 20%. At the industry level, GEMS is mostly jewelry stores, but does allocate more than 40% to companies that either mine diamonds or explore for diamonds.