The deal, still subject to regulatory approval and customary closing conditions, is expected to close by the end of 2017.
Having sold Jimmy Choo, JAB is looking to find new homes for Bally and Belstaff.
After a busy first half, Italian investors are busy finalizing deals in the designer apparel and eyewear sectors.
Glossybox is said to have about 50 million pounds in revenues.
Sources say it remains unclear how much of the company they’re willing to give up.
The deal marks the firm’s first investment from its new fund.
The deal will allow the jewelry designer to expand into all manner of lifestyle products.
The company reports Q2 results today.
Qatar Luxury Group is ceding control through a 13.3 million-euro recapitalization deal for the leather goods maker.
The Buccellati family and private equity Clessidra SGR retain a 15 percent stake in the jewelry firm.