Sotheby's, two world-class auction houses,
At the auction, many new world records of ruby prices were broken.
The level of screening for accepting the auction is very demanding, requiring rare/high-end.
It must also be issued by an internationally renowned laboratory designated by the auction house.
Ruby identification certificate. For example:
(1) "GIA" is the most respected gem appraisal institution in the world.
(2) "Jubelin?" We usually call it Guberlin, but in fact it is also called Gubaolin.
(3) "SSEF" (Appraisal Institute affiliated to Swiss Gemological Institute)
Swiss Jewellery Institute, full name of Swiss Jewellery Institute, referred to as SSEF.
And so on. It is one of the most reliable appraisal institutions such as Christie's, Sotheby's and Baolong.
The commission may be above 20%, even if the auction does not go out; The seller also has to pay the commission of the estimated value!
Next, think for yourself!