After eight years, Gilbertson is leaving his post at the mining company, which is currently facing a slew of operational challenges.
See the Grammy Jewels That Lit Up the Red Carpet
The 63rd annual Grammy Awards delivered the fun the Golden Globes were lacking.

Chalk it up to the in-person red carpet, or the awards’ general sense of fun and lack of seriousness, but the Grammys had the dazzle the Golden Globes were sorely lacking last month, and that was in large part due to the jewels.
Here were the night’s four best jewelry looks.
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Her first look had the most bling, specifically more than 157 carats of diamonds from the jewelry house: a Serpenti high jewelry necklace, Serpenti high jewelry bracelets and rings, Serpenti earrings, and high jewelry rings, all in 18-karat white gold and diamonds.
She also sported a diamond grill.
Beyoncé (below) has been attending the Grammys since 2000, a factoid that makes a lot of sense given she became the artist with the record for most Grammys as of this Sunday.
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Interestingly enough, it’s the same designer behind Lady Gaga’s golden Inauguration Day brooch.
Speaking of Beyoncé, her collaborator and Grammy Award co-winner Megan Thee Stallion (below) channeled old Hollywood glamour.
She wore a full diamond suite by Chopard.
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In addition to diamonds from major jewelry houses, there were some fabulous colored gemstone looks from independent brands, too, like the Katherine Jetter jewels country crooner Miranda Lambert (below) donned.
She wore Jetter’s one-of-a-kind cocktail statement ring featuring a 61.91-carat Burmese blue-gray star sapphire, gray sapphires, purple sapphires, and diamonds in 18-karat white gold. (See it in detail at top of article.)
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Both jewels are currently at The Vault Nantucket pop-up at Hamilton Jewelers’ Palm Beach location.
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