Rare by nature, chosen by hand.
Marianovich Gems begins and ends with one gemologist’s eye. Sergey Marianovich travels to the source, sits across the table from the cutter, and brings home only the stones worth keeping — rare colored gemstones drawn from the world’s most storied deposits.
The eye behind the stones
Sergey is a mineralogist and gemologist, and a GIA Applied Jewelry Professional, with a foundation in the earth sciences. He has spent most of his life around gemstones — drawn to them since his school years, and at the bench ever since. He reads a stone the way few can: color, cut, clarity, and the quality cutters call life, each weighed by hand before a single stone earns its place. We do not chase volume — we curate.
“I would rather place one stone that is truly right than a hundred that are merely available.”
From the world’s most storied deposits
The heart of the collection is origin. Alexandrite and demantoid from the Urals; emeralds from the valleys of Colombia; rubies and sapphires from Burma and Ceylon — gemstones prized not only for their beauty, but for where they were born and how rarely they appear. Alongside them sit museum-caliber collector specimens, acquired for those who value rarity and story as much as color.
Bought with confidence
Every significant stone is offered with transparent disclosure of origin and treatment and, where it matters, a report from a leading laboratory — GIA, GRS, or IGI. Because we buy directly from cutters and sources, what reaches you is honest in both price and provenance. Whether you are a collector, a jeweler, or building a lasting store of value, the guidance is the same: unhurried, candid, and entirely yours.
Above all, my work is not simply to sell gemstones. It is to find the one that feels unmistakably right — and to make the person who carries it genuinely happy.
Sergey Marianovich — President