Mr. Alexandris is the founder and Ceo of GEMLITHOS, which has offices in Germany, Hong Kong, the United Kingdom, Switzerland, and Mainland China. He is a gemologist, antique jewelry expert, author, and philanthropist. Since 1995, he has been dealing with high-end antique jewelry and high-end jewelry. Through the years, he has traded important historical pieces owned by royalty. Several of his transactions have achieved international record prices.

Mr. Alexandris researches antique jewelry in the high-end signed and high-quality gem and jewelry categories. His latest book, Antique Jewelry 1800 - 1939: Appreciating the Dreams, was published in 2024 and is now available. As a philanthropist, part of his book proceeds go to students needing education assistance.

Mr. Alexandris has served on the board of advisors of antique exhibitions in the USA, Emerald Group, and is currently Chairman of the Communication Committee at ICA. He is a member of the Director's Circle at the Victoria & Albert Museum London and a supporter of The British Museum in London.

He has presented on the topic of antique jewelry at congresses, auction houses, TV, and private groups in China, Hong Kong, Indonesia, Germany, Greece, Malaysia, Singapore, Switzerland, Taiwan, the UK, and the USA, to name a few.