MURFREESBORO, Ark.—A Wisconsin man digging at Crater of Diamonds State Park in Murfreesboro found a white diamond Tuesday nearly 4 carats in size.

He will collect it instead of give it to his fiancée.

Eric Blake of Appleton, Wis., was digging with his fiancée when he found the 3.92-carat stone. Blake says the diamond will go into his collection because his betrothed already has a ring and a setting.

Blake also found a 1.49-carat stone Monday. The larger one is big enough to fashion into jewelry, but he said he hasn’t decided whether he will have it placed in...

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