Risha Wa Khaima Diamonds and Jewelry LLC

05/05/2026

A 6.03-carat blue-diamond ring is likely to fetch as much as CHF 9.5 million ($12.2 million) at an upcoming Sotheby’s sale in Geneva.

The ring centers a cushion-shaped, fancy-vivid-blue, internally flawless, type IIb stone. It will be among the top pieces at the May 12 High Jewelry auction, according to the auction house’s website.

Full article: Linked below

05/05/2026

18/04/2026

18/04/2026

AGTA is partnering with for the inaugural Stuller Color of the Year Award at the 2026 AGTA Spectrum & Cutting Edge Awards. ✨

One award will be presented in each division of the competition for the outstanding use of Stuller’s Color of the Year—Signature Red. ❤️

💎 Cutting Edge – all non-wearable entries
💍 Spectrum – all wearable entries

How to enter? Simply check the Stuller Color of the Year box on the entry form. ✔️

Submissions open this summer. Be the first to know when they open by signing up for our newsletter—link in bio! 🔗

18/04/2026

Sotheby’s will showcase a 4.37-carat alexandrite ring at its upcoming Hong Kong jewelry sale, expecting the piece to fetch up to HKD 1.5 million ($191,460).

The ring features a color-changing oval Brazilian alexandrite that shifts between greenish-blue during daylight and purple under incandescent light. It will lead the auction house’s Fine Jewelry sale, which runs from April 15 to 29.

Read more about the upcoming auction: Linked below

13/02/2026

The Gemological Institute of America (GIA) recently examined an undrilled white semi-baroque nacreous saltwater pearl.

👇Full article linked in a comment below.

13/02/2026

With Gubelin Gemmology – I'm on a streak! I've been a top fan for 7 months in a row. 🎉

23/01/2026

With Gubelin Gemmology – I'm on a streak! I've been a top fan for 6 months in a row. 🎉

31/12/2025

Holiday Closure Notice

Please be informed that the following Gübelin Gem Lab locations will be closed for the Christmas and New Year break:

Lucerne Laboratory: Closed from 22nd December to 2nd January

Hong Kong Laboratory: Closed from 22nd December to 2nd January

Bangkok Laboratory: Closed from 22nd December to 2nd January

New York Laboratory: Closed from 25th of December to 2nd January

All laboratories will resume operations on 5th of January 2026.

We encourage clients to plan their submissions accordingly, as services and reporting activities will recommence once the laboratories reopen.