TORONTO - Aber Diamond Corp. stock (TSX:ABZ) had one of its biggest gains this year on Thursday after the company's chief executive said the diamond miner and retailer would try to buy the remaining stake in the Diavik mine if partner Rio Tinto wants to sell it.

"If they ever should want to decide that they sell, we have a right to buy it and we would do our best to exercise that right," Robert Gannicott said in a telephone interview.

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