Expect the Unexpected

Dr. Lore Kiefert has compiled a number of subjects that she came across her long career in three major gemmological laboratories (SSEF, AGTA GTC, Gübelin Gem Lab) plus her recent experience in an appraisal lab. Among the many subjects, here is a small selection: Covered are individual gemstone groups such as Paraiba tourmaline or corundum, but also unusual pieces are presented. A historic ring, a large star sapphire cluster, faked reports, damages by laser welding, black Ethiopian opals, some corrections to erroneous statements on social media, as well as a number of imitation cases.

Contents

Diamonds:  

- Diamond pieces glued on topaz and glass

- when the cut doesn‘t match the age of the ring

- írradiated blue diamond with fake GIA report

Corundum:  

- The Serendipity star sapphire cluster

- Ti- vs internal diffusion in sapphires

- some clues to detect low temp in rubies and sapphires

Beryl:  

- Difference between Aquamarine and Maxixe beryl

- A large emerald cluster from Zambia

Tourmaline:   

- All about Paraiba tourmaline in 10 minutes

Spinel:   

- Detection of heat treatment in spinel

- Cobalt spinel vs blue spinel

Opal:   

- Black opal from Ethiopia

Pearls:  

- Melo imitation

- Distinction of black pearls

Stones in jewels:

- Laser damage due to repair work