info@joisilva.co
ABOUT US
ORGANIZATION
CORPORATE
WORLDWIDE BRANCHES
LEGAL & ACCOUNTING
CUSTOMS & SECURITY
PRECIOUS MINERALS
GRADE SCALE
PRECIOUS MINERALS
ARCHIVES
MINING SERVICES
KIMBERLEY
SPECIAL MISSIONS
MINING SUPPORT
LENDING CLUB
INVESTMENT
CONTACTS
ABOUT US
ORGANIZATION
CORPORATE
WORLDWIDE BRANCHES
LEGAL & ACCOUNTING
CUSTOMS & SECURITY
PRECIOUS MINERALS
GRADE SCALE
PRECIOUS MINERALS
ARCHIVES
MINING SERVICES
KIMBERLEY
SPECIAL MISSIONS
MINING SUPPORT
LENDING CLUB
INVESTMENT
CONTACTS
Grade Scale
GIA Clarity Grading Scale
GIA Clarity & Color Grading Scale
GIA Color chart
GIA Typical Color Grades
® Since 2002 - 2021 JOISILVA All rights Reserved
