The Gem Consultants Ltd. set up five years ago by Yue and her brother has already established its authority in Taiwan and Southeast Asian nations.
在國內，甚至於東南亞各國，余玉雲的鑑定，已樹立了相當的權威。珠寶商銀樓業者都承認，經過專業鑑定的寶石，因為擁有證書，毋須多費唇舌，交易比以前簡便順利得多，好的珠寶很容易脫手。國外來的觀光客，近兩年來，也都很放心地在台灣購買有品級證書的珠寶。