He did not accept the S$10 out of pride, he said.
They were detected in the sea off Tanah Merah, which is within Singapore's territorial waters.
The Singaporean men, aged 46 and 56, have been detained for 2 days by the Malaysian police.
The 57-year-old suspect will be charged in court for the offence of voluntarily causing grievous hurt.
The restaurant initially believed the man had fairly finished a combined 14kg of curry rice.
Officials confirmed that the duo had unearthed a 15.34-carat diamond.
Clumps of hair were found on the pillow, and the acid had eaten through the bedding.
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Preliminary investigations do not indicate foul play.
The injuries forced the woman and her husband to cancel a trip marking their 50th wedding anniversary.