We Are Arete Diamond
Natural diamond experts with top-level certification and 25 years of tradition in the jewelry industry.
Diamond Experts
As one of the few diamond dealers from the Czech Republic, we are members of the Diamant Club van Antwerpen diamond exchange. We hold the highest possible education in diamond grading from leading gemological institutions GIA and HRD Antwerp. Hundreds of thousands of diamonds have passed through our hands, making us one of the most prominent diamond dealers in the Czech Republic.
We specialize in selling certified natural jewelry and investment diamonds at unbeatable prices.
Arete Diamond Office
The Arete Diamond office is part of Umarutti s.r.o., a company with a 25-year tradition in the jewelry industry. We have been dealing with diamonds at a professional level for more than 10 years.
Our Team
GIA and HRD certified experts who will take care of you.
Vladimír Kondratěnko
Head of Arete Diamond Office
Vladimír participated in most negotiations with international suppliers as part of the family jewelry business from a very young age — first as an observer and later as the company’s managing director.
JUDr. Marie Hérová, CSc
GIA Diamonds Graduate
Dr. Marie Hérová received her professional education in London and holds the GIA Diamonds Graduate diploma. Marie has deep knowledge and experience in diamond grading and has been active in the jewelry industry for more than 28 years.
Dominika Černá
GIA Diamonds Graduate
Dominika is a GIA Diamonds graduate and an enthusiast of natural diamonds and colored gemstones. She helps clients select the ideal diamond for their jewelry.
Lucie Pýchová
Diamond Specialist
Lucie specializes in natural diamonds and helps clients choose the best stone for their needs.
Vladimír Kondratěnko
Head of Arete Diamond Office
Vladimír participated in most negotiations with international suppliers as part of the family jewelry business from a very young age — first as an observer and later as the company’s managing director.
At 18, he completed his first gemological course in London on diamond grading from GEM-A. He then traveled to Antwerp, Belgium, where he established a lasting friendship and business partnership with a prominent diamond dealer representing one of the world’s largest diamond cutting companies.
He continued his education at the leading European gemological laboratory HRD Antwerp, where he received the Certified Diamond Grader diploma.
A significant milestone in his career was the opening of the Arete Diamond office in the Stock Exchange Palace in Prague 1 in 2009. In 2011, he completed diamond grading studies at GIA and received the GIA Diamonds Graduate diploma.
In 2012, at just 22 years of age, he was officially invited by his business partners in Antwerp to become a member of the diamond exchange. Vladimír thus became the youngest member and shareholder of Diamant Club Van Antwerpen from the Czech Republic.
Our Certifications & Memberships
Members of the Antwerp Diamond Exchange Diamant Club van Antwerpen
Members of the World Federation of Diamond Bourses
HRD Certified Diamond Grader diploma
GIA Diamonds Graduate diplomas
100% conflict-free diamonds
Diplomas & Certificates
Professional Equipment
We use state-of-the-art instruments for diamond detection and grading.
D-Secure
Advanced instrument for detecting lab-grown diamonds from 0.003 ct. Directly detects CVD and HPHT diamonds.
D-Screen (HRD Antwerp)
Screening instrument from the leading European gemological laboratory.
Gemological Microscope
Professional microscope for detailed evaluation of inclusions and diamond structure.
UV Cabinet
Specialized cabinet for evaluating diamond fluorescence.
Our Services
Certified Diamonds
We offer natural jewelry diamonds with GIA certificates from 0.30 ct and HRD Antwerp from 0.09 ct. In the D–K color range as well as natural fancy colored diamonds.
Investment Diamonds
Diamonds with exceptional parameters meeting strict quality criteria. We offer them exclusively with GIA certificates at unbeatable prices.
We Uphold High Standards
We work exclusively with GIA, HRD Antwerp, and occasionally IGI certificates, which guarantee certainty, precise grading, and transparency. We place great emphasis on fully informing customers about the diamonds they purchase from us.
We never offer diamonds with EGL International certificates, which are commonly overgraded.
In the press
