Gemologist won the Wood to remain unbeaten last year, then finished 16th in the Derby.

WSJ: Verrazano wins Wood to remain unbeaten

He will be riding Gemologist in an effort to join other undefeated Kentucky Derby winners.

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Castellano and Gemologist are currently the favorite at 9-1 odds in the 21-horse field.

FORBES: Jewelry Retailer Places Bet on Kentucky Derby

Courses rang from lab and jewelry manufacturing arts to those that lead to a Graduate Gemologist diploma.

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Heading into the Derby, Castellano and Gemologist have won four straight races, including the Grade 1 Wood Memorial.

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Like Verrazano, Gemologist went to the Derby unbeaten, where he finished 16th.

WSJ: Verrazano wins Wood to remain unbeaten

It's the third Wood win in the past four years for Pletcher, who won it with Eskendereya in 2010 and Gemologist last year.

WSJ: Verrazano wins Wood to remain unbeaten

"Customers have been looking for smaller items that are more unique but of higher quality, " says Seth Bloomgarden, a gemologist at Belenky Brothers.

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Also, Mr. Abraham and Eric, a gemologist, have started a website, Watchrepairco.com, in hopes that dealing with customers online will be safer than in person.

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So it was good fortune indeed to be invited to take a brief course in jade identification, given by the gracious Roxanne Tu, Senior Gemologist at Taipei's Museum of Jade Art.

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Well, for a start, there are those eyes, which are famously of a hue that would make a gemologist give little groaning sounds in his sleep, yet the look that they deliver mingles the come-hither with the stay-away.

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