REQUEST ACCESS

Mendel Gems International

Legacy of Excellence in Gem Investments.

Direct from Gaborone & Antwerp master cutters
Strictly private placement – qualified introductions only

No Public Pricing. Ever.

REQUEST ACCESS

Domestic Violence Diamond

A limited parcel dedicated to
supporting survivors.
100% of profit donated.

Unique Hand-crafted

Master-cut, one-of-one fancy shapes
direct from the bench. Never re-cut.

Special Cut Diamonds

Proprietary and historical cuts – Portuguese,
old-mine, branded fancies.

About Us

Custom Diamond
Jewellery Design

At Mendel Gems International, custom design begins long before the sketch. Every piece is born from investment-grade diamonds and coloured stones sourced directly through our DTC Botswana allocation and private master-cutter relationships in Antwerp, Jaipur, and Tel Aviv. Whether you require a flawless Type IIa centre stone, an unheated Burmese ruby, or a one-of-a-kind hand-crafted fancy cut that exists nowhere else, we reserve the rarest parcels exclusively for bespoke commissions. From concept to completion, Jeffrey Mendel and our GIA graduate gemologists oversee every detail – cut, proportion, provenance, and final polish – ensuring each creation is not only beautiful, but built to preserve and grow generational wealth. Public pricing is never displayed. All custom projects are strictly confidential and available by private appointment only.

Jeffrey Mendel – CHAIRMAN CEO

Jeffrey Mendel is a third-generation gemologist and one of the industry’s few remaining independent rough-diamond allocation holders with permanent facilities inside DTC Botswana, Gaborone.

Raised between Antwerp and New York, Jeffrey began sorting parcels on the trading floor at age twelve alongside his father and grandfather. After earning his Graduate Gemologist diploma from GIA New York, he spent over a decade sourcing directly in Bangkok, Mumbai, Yangon, and Tel Aviv before securing personal rough allocation rights with DTC Botswana in 2015 – an investment that today grants Mendel Gems priority access to sight-holder goods that never reach the open market.

Known equally for unheated Burmese rubies, Type IIa investment diamonds, and one-of-a-kind hand-crafted fancy cuts, Jeffrey maintains direct, decades-long relationships with the world’s finest master cutters who reserve their most exceptional stones exclusively for his network.

He operates with a deliberately simple rule: only acquire and place stones he would personally own, and only with buyers who value provenance, discretion, and long-term relationships above all else.

Today Jeffrey divides his time between New York, Gaborone, and Antwerp, personally overseeing every parcel that carries the Mendel Gems name.

Legacy,
discretion,
and direct global access.

For three generations we have quietly connected verified buyers with investment-grade diamonds and rare colored stones that never appear on the open market. From DTC Botswana rough allocations to unheated Burmese rubies and one-of-a-kind hand-crafted fancies, Mendel Gems exists to deliver opportunities that others simply cannot.

Business vision

To remain the most trusted private gateway between mine, cutter, and collector — preserving generational relationships while placing only the finest, fully documented stones with clients who value provenance above all else.

Our mission

Source exclusively at origin, document without exception, and introduce only to qualified principals. We never list prices publicly and never compromise discretion.

Our support

Source exclusively at origin, document without exception, and introduce only to qualified principals. We never list prices publicly and never compromise discretion.

Gallery

Crafted Excellence: From Rough to Radiance

Step inside the ateliers of Mendel Gems International, where master cutters in Antwerp and Jaipur transform raw DTC Botswana diamonds into investment-grade masterpieces. Each image captures the precision of hand-crafted fancy cuts, unheated colored stones, and GIA-certified parcels – available exclusively to verified partners. From the loupe’s focus to the final polish, discover the artistry behind stones that define legacy.

years

0 +

Employee

0 +

Page views

0 %

Awards

0 +

“Jeffrey Mendel’s direct DTC Botswana access made all the difference. We secured a flawless 12-ct Type IIa diamond parcel that elevated our entire collection. Discreet, documented, done.”

A.R., Private Collector

Monaco

“In a market full of middlemen, Mendel Gems cuts straight to the source. Their hand-crafted fancy cuts are unlike anything we’ve seen – and the provenance is impeccable.”

Elena S., Luxury Jeweler,

Milan

Testimonial title

“From initial inquiry to secure delivery, Jeffrey handled our $2.5M colored-stone investment with absolute professionalism. Returns exceeded expectations; trust is total.”

David K., Family Office

Hong Kong

Testimonial title

“Mendel Gems doesn’t just source stones – they source stories. Our unheated Burmese ruby acquisition was seamless, ethical, and exactly as described. Five stars.”

Sophia L., Auction House Director

London

Testimonial title

“As a long-time sight-holder, I appreciate Jeffrey’s insider knowledge. He connected us to a special-cut diamond lot no other firm could touch. Highly recommended.”

Robert M., Diamond Manufacturer

Antwerp

Testimonial title

“The team at Mendel Gems turned a complex request into a simple success. Ethical sourcing, GIA certification, and personal attention – they’re our go-to for rare parcels.”

Victoria P., High-Net-Worth Advisor

New York

Testimonial title

“Jeffrey’s 2015 DTC investment pays dividends for clients like us. We placed a multi-million emerald parcel with zero issues. Integrity in every facet.”

Thomas H., Institutional Buyer

Geneva

Testimonial title

“Mendel Gems delivered a one-of-a-kind hand-crafted sapphire that became the centerpiece of our bridal line. Fast, confidential, and world-class quality.”