This retailer could signal trouble for the rich

Shares of luxury retailer Tiffanymay be the most expensive thing sold with the company's name on it.

Trading at 20 times its next twelve months' price to earnings ratio, Tiffany share are currently near their all-time high of $82.84, reached earlier this month.

Compare Tiffany's returns to other luxury brands. Ralph Lauren, for example, is up 15% this year, but the last six months have seen that name flat. Coach, meanwhile, is down 4%. Tiffany, however, has rewarded investors with a 40% return since the start of 2013.

Meanwhile, retailers as a whole are up 25% for the year as measured by the SPDR Retail ETF (XRT) but August has been a cruel month and the index is down 5% since August 1.

(Read: Consumers getting choosier, so should retail stock investors)

Tiffany is thought of by many to be a barometer of the high-end market. So, as investors await earnings numbers from the company tomorrow morning, could this iconic brand signal trouble for well-heeled customers and investors, too? Or is there more to this story?

Talking numbers on Tiffany is Brian Nagel, Senior Analyst at Oppenheimer & Co. Nagel says there is one sector which could give an indication of where Tiffany is headed and it's one most investors wouldn't normally associate with luxury.

(Read: US we have a problem, and its name is durable goods)

On the charts is CNBC contributor Abigail Doolittle. She looks at Tiffany and believes there may be some warning signals already appearing in the charts.

Is Tiffany now too rich to buy? To hear Nagel and Doolittle analyze Tiffany, watch the video above and decide.

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