MB & B Gemological Services

05/07/2026

Two big deliveries to make tomorrow!

05/01/2026

A 5.04 ct spinel accompanied by a Lotus report achieved CHF40,640 at a recent Sotheby's sale in Switzerland.

Fine spinels have seen increasing attention in recent years, with growing appreciation among collectors.
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📸 : Sotheby's
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04/30/2026

Something very special about vivid robin’s egg blue, Persian turquoise.

Only one available at MB&B

10K Yellow Gold
Size: 8

$550 (plus tax)

04/20/2026

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04/07/2026

An emerald and diamond ring stole the show at a recent jewelry sale at Phillips in Hong Kong.

The piece, which features a step-cut, 9.22-carat Colombian emerald within a surround of trapeze-cut diamonds, brought in HKD 5.4 million ($691,522) at the Hong Kong Jewels auction, which concluded on March 30, according to the Phillips website. The price was within its HKD 4.8 million to HKD 6.5 million ($640,000 to $833,000) estimate.

See the rest of the top pieces: Full article linked below

04/07/2026

A Cartier ruby and diamond ring took the spotlight at the recent Sotheby’s auction in Paris, bringing in more than eight times its high estimate.

A bombé design, the piece centers an oval cushion-shaped, 4.12-carat Burmese ruby, with a surround of brilliant- and single-cut diamonds. It realized EUR 486,400 ($560,322) against a high price of EUR 60,000 ($69,119) at the March 31 Fine Jewelry sale, according to Sotheby’s.

See the rest of the top pieces: Full article linked below

03/16/2026

The best way to ensure our grading is to the same standard as the GIA is by testing our skills by grading against graded samples.

03/01/2026

Did you know that fluorescence plays a key role in the world of rubies?

Depending on their geological origin and trace elements, many rubies fluoresce red under ultraviolet (UV) light. In the past, this fluorescence was perceived as a magical inner “glow.” Today, we know that it is caused by the presence of chromium within the crystal structure.
The most famous pigeon blood rubies are examined by the Gübelin Gem Lab under strict criteria and must display weak or stronger fluorescence under short-wave (254nm) UV-light and medium or stronger fluorescence under long-wave (365nm) UV-light.

Want to learn more about fluorescence and why it matters, especially in rubies? Join our Gübelin Academy courses and deepen your knowledge through hands-on training and expert instruction.

To register, contact us at: [email protected]

02/17/2026

01/20/2026

Opal magic...

Louis Vuitton’s High Jewelry “Conquêtes” Collection. 37.07 Imperial Topaz, Demantoid Garnet, Opals and Diamonds Set In White Gold and Platinum.