Yep his father is American and he was born in the US but they moved to Japan when he was welly small. Then came through some Japan club de youth system and the U15 U19 etc for Japan. Looks wise, he different - but can consider Japanese already.
Many of the healthy looking jpmm moi post in the "gym" thread also half jippunese only, but ..
if TB i buy 1 single stone at a time then get it check locally cause crystal can be natural, dyed, treated, synthetic, heat treated, glass, resin etc.....
here a few dealer that can check the stones:
Nan Yang Gemological Institute
Singapore Gemology Authority
Gemological Identification Laboratory
Raffles GemLab
Universal gemological laboratory
GemRight Gemology | Independent Gem Laboratory