Professional Gemstone Testing Laboratory - PGTL

20/07/2026

09/07/2026

26/06/2026

The laboratory of the Deutschen Stiftung Gemstoneforschung had the privilege of investigating the wedding ring of Katharina von Bora, whose wedding to the reformer Martin Luther in 2025. It's a year. The gold ring, one of the most famous treasures of the Leipzig City History Museum, consists of two parts, an inner narrow gold ring and an outer Arma Christi ring with a lively ruby. The physical and chemical properties coincide with those of rubies found in the Mogok region of Burma, giving another indication of trade in gemstones between Europe and Asia in the late 15th. and early 16th. Century.

Read more about it in our blog:
https://blog.dgemg.com/de/zeitschrift-inhalt/211-gemmologische-untersuchung-des-rubins-im-ring-der-katharina-von-bora-lutherring.html

Das Labor der Deutschen Stiftung Edelsteinforschung hatte das Privileg, den Trauring der Katharina von Bora zu untersuchen, deren Hochzeit mit dem Reformator Martin Luther sich im Jahr 2025 zum 500. Male jährt. Der Goldring, einer der bekanntesten Schätze des Stadtgeschichtlichen Museums Leipzig, besteht aus zwei Teilen, einem inneren schmalen Goldreif und einem äußeren Arma Christi-Ring mit einem lebhaften Rubin. Die physikalischen und chemischen Eigenschaften stimmen mit denen von Rubinen aus dem Gebiet von Mogok in Burma überein und geben damit einen weiteren Hinweis auf den Handel mit Edelsteinen zwischen Europa und Asien im späten 15. und frühen 16. Jahrhundert.

Lesen Sie mehr dazu in unserem Blog:
https://blog.dgemg.com/de/zeitschrift-inhalt/211-gemmologische-untersuchung-des-rubins-im-ring-der-katharina-von-bora-lutherring.html

07/06/2026

💎👍🏻👌🏻

02/06/2026

28/05/2026

🌙✨ Eid ul Adha Mubarak! ✨🌙
May this blessed occasion bring peace, happiness, and countless blessings to you and your loved ones. 🤍
Let us celebrate the spirit of sacrifice, gratitude, and togetherness with kindness and compassion.

🐐🕋 Wishing everyone a joyful Eid filled with love, prosperity, and unforgettable moments.



Professional Gemstone Testing Laboratory - PGTL

20/05/2026

✨ Gemstone History Spotlight: The Princess Faiza Emerald Collaret ✨

When we think of high-jewelry mastery, few eras match the structural brilliance of the Art Deco period, and few pieces tell a story quite like the breathtaking emerald and diamond necklace belonging to HRH Princess Faiza of Egypt.

As a gemstone testing laboratory, we are constantly in awe of pieces where nature's finest creations meet unparalleled human craftsmanship. This iconic collaret, crafted by Van Cleef & Arpels, features an imposing fringe of nine perfectly graduated drop-shaped emeralds hanging flawlessly from geometric, baguette-cut diamond surmounts.

What makes this masterpiece truly extraordinary is not just its striking geometry, but its journey through time—a miraculous survivor of a vanished royal court.

Take a walk through its incredible history below 👇

⏳ The Lifetime of a Royal Masterpiece

The Genesis
1929
The necklace is initially designed and created by the Parisian high-jewelry house Van Cleef & Arpels, epitomizing the clean lines, sharp geometry, and structural elegance of early Art Deco design.

The Art Deco Evolution
1937
The necklace is beautifully modified by the maison, altering its flow to perfectly accentuate the exceptional quality and intense color of the nine graduated drop-shaped emeralds.

Acquired by Royalty
1947
Known for her exquisite, avant-garde taste, Princess Faiza of Egypt (sister to King Farouk) purchases the masterpiece to wear as an imposing yet incredibly graceful "Court Jewel."

Surviving the Revolution
1952
Following the Egyptian Revolution and the exile of the royal family, countless crown jewels are seized, sold, or entirely dismantled. Remarkably, this emerald masterpiece remains completely intact as Princess Faiza safely takes it into exile.

The Multi-Million Dollar Rediscovery
2013
Decades after the Princess's passing in California, the legendary necklace re-emerges on the world stage. It is sold at Christie's Geneva auction for a staggering $4.2 million, later returning to the heritage collection of its original creator, Van Cleef & Arpels.
From a gemological perspective, historic pieces like this remind us why emeralds have captured the human imagination for millennia. Their delicate, drop-shaped tailoring required a steady, master lapidary hand to maintain absolute color consistency across all nine major stones.

What is your favorite era of jewelry design? Let us know in the comments below! 👇

17/05/2026

Discover the breathtaking beauty and mysterious history of the legendary Koh-i-Noor Diamond 💎👑

Known as one of the most famous diamonds in the world, the Koh-i-Noor has passed through empires, royal crowns, and centuries of history. Its unmatched brilliance and royal legacy continue to captivate the world ✨

Experience the sparkle, luxury, and mystery of this iconic treasure in stunning cinematic detail.

12/05/2026

Discover the breathtaking beauty of the legendary Hope Diamond — one of the world’s most famous and mysterious gemstones 💎💙
Known for its rare deep-blue brilliance and fascinating history, this iconic diamond has captivated the world for centuries.

07/05/2026

Hidden deep within the earth for millions of years… the legendary Dom Pedro Aquamarine is one of the most breathtaking gemstones ever discovered 💎🌊

Known as the largest cut aquamarine in the world, this incredible blue crystal showcases unmatched clarity, beauty, and craftsmanship. Watch as light dances through its mesmerizing ocean-blue tones in this cinematic gemstone showcase ✨

A true masterpiece of nature and artistry.

💙 Don’t forget to LIKE, SHARE, and FOLLOW for more legendary treasures and rare gemstones!