ShineBright hires Robert Manse, Sarine names new CEO in succession plan
ShineBright put Robert Manse on lab-grown sales, while Sarine set a July 1 CEO handoff. The moves point to a diamond trade chasing growth and tighter technology control.
The diamond business is rearranging its leadership around two pressure points: getting lab-grown jewelry into more retail doors and tightening control of the technology that grades, plans and moves stones through the supply chain. ShineBright brought in Robert Manse to lead sales and marketing for its lab-grown diamond business, while Sarine Technologies laid out a succession plan that will hand the chief executive role to Tzafrir Engelhard on July 1, 2026.
At ShineBright and its parent, Dynamic Design Group, Manse was appointed president of sales and marketing. The company cast the hire as a push to strengthen retail relationships and widen market reach, and the choice fits a profile built for a business trying to turn lab-grown demand into sustained shelf space. Manse brings more than 30 years of experience across product development, sourcing, manufacturing, branding and distribution, and ShineBright said he has helped generate more than $200 million in branded retail sales. That kind of résumé suggests the company wants more than a spokesman for the category; it wants someone who can translate lab-grown volume into sell-through.
The timing also matters. ShineBright, which described itself as a supplier of natural and lab-grown diamond jewelry since 1995, said lab-grown diamonds accounted for about 5 percent of global diamond jewelry sales in 2018, were expected to top 10 percent in 2022 and could reach 20 percent by 2030. Those are the numbers that explain why sales leadership is becoming a strategic post, not just an operating one. The fight now is not only about production capacity, but also about who can win consumer confidence, retail placement and pricing discipline as the category expands.
Sarine’s move points to a different but related priority: precision technology and continuity. The company appointed Engelhard as chief executive effective July 1, 2026, replacing David Block under a planned succession announced May 11, 2026. Engelhard is a nearly 20-year Sarine veteran who spent nine years as vice president of business development collaborations and has also held roles in business development, operations and leadership, including as managing director of the company’s Indian subsidiary. Sarine, listed on the Singapore Exchange Mainboard and the Tel Aviv Exchange, has built its business around precision technology for diamond and gemstone evaluation, planning, processing, measurement, grading and trading, so the internal promotion signals a desire to keep technical depth at the center of the company’s next phase.
The boardroom churn is not isolated. Chrono24 named José Gaztelu chief executive officer on May 6, 2026, as Bloomberg reported a strategic split under the previous boss even while the secondary watch market rebounded. Signet Jewelers followed on May 7 with board and committee changes, including former Macy’s chairman and chief executive Jeffrey Gennette joining its board effective May 6. Together, the moves show a luxury and diamond trade trying to reset leadership around growth channels, market recovery and the technology stack that now underpins trust.
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