Editor's Note: Any reference to TheStreet Ratings and its underlying recommendation does not reflect the opinion of TheStreet, Inc. or any of its contributors including Jim Cramer or Stephanie Link. All three major indices are trading down today with the Dow Jones Industrial Average ( ^DJI) trading down 42 points (-0.3%) at 15,487 as of Wednesday, Sept. 18, 2013, 12:55 PM ET. The NYSE advances/declines ratio sits at 930 issues advancing vs. 1,976 declining with 128 unchanged. The Basic Materials sector currently sits down 0.5% versus the S&P 500, which is down 0.2%. On the negative front, top decliners within the sector include Halliburton Company ( HAL), down 1.0%, Marathon Petroleum ( MPC), down 1.1%, Canadian Natural Resources ( CNQ), down 0.9%, Total ( TOT), down 0.7% and Apache Corporation ( APA), down 0.7%. Top gainers within the sector include Kinder Morgan ( KMI), up 2.5%, Monsanto Company ( MON), up 1.6%, Kinder Morgan Energy Partners ( KMP), up 1.2%, Freeport-McMoRan Copper & Gold ( FCX), up 0.9% and Air Products & Chemicals ( APD), up 1.0%. TheStreet would like to highlight 5 stocks pushing the sector lower today: 5. Dominion Diamond ( DDC) is one of the companies pushing the Basic Materials sector lower today. As of noon trading, Dominion Diamond is down $3.55 (-21.5%) to $12.95 on light volume. Thus far, 42,721 shares of Dominion Diamond exchanged hands as compared to its average daily volume of 245,300 shares. The stock has ranged in price between $12.94-$13.01 after having opened the day at $13.01 as compared to the previous trading day's close of $16.50. Dominion Diamond Corporation engages in the mining and marketing of rough diamonds. The company owns a controlling interest in the Ekati Diamond Mine; and a 40% ownership interest in the Diavik Diamond Mine located in Canada's Northwest Territories. Dominion Diamond has a market cap of $1.1 billion and is part of the metals & mining industry. Shares are down 7.5% year to date as of the close of trading on Tuesday. Currently there are 3 analysts that rate Dominion Diamond a buy, no analysts rate it a sell, and 1 rates it a hold. TheStreet Ratings rates Dominion Diamond as a sell. The company's weaknesses can be seen in multiple areas, such as its feeble growth in its earnings per share, unimpressive growth in net income, disappointing return on equity, poor profit margins and generally disappointing historical performance in the stock itself. Get the full Dominion Diamond Ratings Report now. STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12-months. Learn more.