Shares of the

Diamonds Trust

(DIA) - Get Report

ETF, which tracks the Dow Jones Industrial Average, fell 1% after

Alcoa

(AA) - Get Report

and a handful of other Dow components slid lower Tuesday.

Alcoa led the losers on the downside, with shares falling about 5% after the aluminum company posted disappointing second-quarter sales. Other Dow losers included

Home Depot

(HD) - Get Report

, which dropped 75 cents, or 2%, to $34.25; and

Pfizer

(PFE) - Get Report

, which slid 58 cents, or 2%, to $23.29. The Diamonds Trust was recently trading down 64 cents to $110.51.

ETFs that follow the precious metals markets rose significantly Tuesday. The

iShares Silver Trust

(SLV) - Get Report

jumped $4.66, or 4%, to $115.50. Shares of

streetTRACKS Gold Shares

(GLD) - Get Report

rose $1.75, or 3%, to $63.77. The

iShares COMEX Gold Trust

(IAU) - Get Report

ETF, meanwhile, tacked on $1.72, or 3%, to $63.87.

A host of energy ETFs were trading higher Tuesday as crude oil prices climbed above $74 a barrel. The

United States Oil

fund

(USO) - Get Report

advanced 83 cents, or 1.2%, to $70.39, while the

Oil Services HOLDRs

(OIH) - Get Report

rose $1.46 to $146.46. The Energy Select Sector SPRD rose 52 cents to $57.38. The

iShares Dow Jones U.S. Energy

(IYE) - Get Report

ETF climbed 87 cents to $97.32.

The

iShares Goldman Sachs Networking

(IGN) - Get Report

ETF fell 1% after

Lucent

(LU)

warned that its third-quarter results would be below Wall Street's forecast. Lucent was recently trading down 14 cents, or 6%, to $2.20.

Nortel Networks

(NT)

, another holding in the networking ETF, fell in sympathy. Nortel recently was down 15 cents, or 7%, to $2.09. The iShares ETF, meanwhile, was down 25 cents to $27.72.