Deputy Chairman of the Board of Directors of Jeddah's Chamber of Commerce and Industry Mazin Buturji opened here last night the 4th international show for jewelry and precious stones. The show is organized under the patronage of Princess Adela bint Abdullah Bin Abdul-Aziz and the auspices of the National Committee for precious minerals and stones at the Chamber's headquarters in Jeddah. The convening of the show aims at providing investment opportunities for local merchants.