Biggest Diamonds Are Resisting the Price Drop in Precious Stones

The biggest diamonds are holding their value as smaller gems slump, according to the miner that unearthed this century’s largest stone.

Prices for Gem Diamonds Ltd.’s stones that are larger than 10 carats have fallen about 3 percent in the first half of this year, Chief Executive Officer Clifford Elphick said by phone on Wednesday. That compares with declines of about 30 percent for smaller gems.