What our clients say.

"Two decades with the major American houses, then a single afternoon at Hatton Garden. Xene's protocol is exhaustive; the certificate reads like a curatorial entry. I will not use anyone else."

"We catalogue every Xene-certified lot at premium. Buyers in Asia and the Middle East ask for it specifically. The Lloyd's guarantee closes negotiations."

"Their bibliographic descriptions for our Caxton fragment were more thorough than the original auction-house catalogue from 1962. Worth every penny."

"We moved a six-figure modern card portfolio to Xene last year. The subgrade transparency and population reporting transformed how we model exit value."

"Xene a re-certifié une lettre dont l'authentification était discutée depuis vingt ans. Leur rapport descriptif a clos le débat."

"The cross-certification programme is the cleanest in the market. Original holders returned intact, fresh grades on identical or better surface, never a quibble."

"Xene certificates are now standard reference for our Western-coin sales. The bilingual documentation removed our principal friction point."

"They visited the property, conducted on-site grading of nine hundred items in a week, and handled HMRC and probate paperwork start to finish."