[2] A network of touts and con men present the mark with an opportunity to profit from buying discount gems from a jewelry shop.
[3] The mark is convinced that he can buy gems at duty-free price and bring them overseas for a threefold or more profit.
Once in a store, a variety of selling tactics are employed, including bait and switch, and "educating" gemstone novices about "fake gems" which are in fact real, and selling them "real gems" which are in fact fake.
Here the jewelry sold is of regular quality, but overpriced due to large commissions charged on them.
Also, a similar scam takes place with old Dutch VOC-coins, supposedly from ship wrecks, which are sold to tourists.