Iron-ore prices may soon sag as supply rises and steel demand fades, according to Citigroup.
Oil extends its retreat from a seven-week high on Tuesday amid supply concerns.
The surprising rebound in gold prices this year has given new life to unwanted jewellery and coins - in the melting pot.
Oil heads for its biggest weekly jump since March amid speculation that major producers will act to freeze output.
Oil edged higher to near $42 a barrel in Asia on Monday - but analysts said the increase was unlikely to last.
Gold has regained its lustre as investors seek havens from volatile markets and weak interest rates.
Oil prices edged up slightly in Asia on Tuesday after tumbling more than two percent the day before.
Oil prices dipped on Monday, extending last week's losses on fresh worries about a global supply glut.
The big players in the investment world are looking at diamonds in a different way.
Oil prices ticked higher on Friday, but analysts warned worries over the global supply glut would limit gains.
Oil prices edged up in Asia on Thursday following US data showing a drop in crude inventories.
Anglo American reduced its full-year copper-production target after bad weather hit its operations in Chile.
Oil prices rose on bargain-buying in Asia on Wednesday after hitting two-month lows.
South Africa's sky-high maize prices could normalise next year as crops recover from a devastating drought this season.
Oil prices extended their decline in Asia on Tuesday as the global glut returned to focus.