Central Gem Laboratory Co., Ltd.
3-4 -26
Osaka City
06-6245-5187
Japan Gemological Service Osaka
3-2 -1
Osaka City
06-6252-5420
Kokuhoren
1-8 -27
Osaka City
06-6252-8818
Kome Shokumi Kanteishi Kyokai
3-12 -15
Osaka City
06-6100-1151
Nihon Kogaku Kantei Center
4-5 -5
Osaka City
06-6364-6038
Okuda Bunsho Kantei Kenkyusho
4-5 -5
Osaka City
06-6362-8774
Shimizu Hokagaku Consultant Office
4-5 -5
Osaka City
06-6313-1318