Inventor

HILSENSTEIN VOLKER

AU2 patents

Patents

2 patents

US9222893B2Dec 29, 2015

Modified apparatus and method for assessment, evaluation and grading of gemstones

HORNABROOK GRAHAM ALFRED16 citations74

US8436986B2May 7, 2013

Apparatus and methods for assessment, evaluation and grading of gemstones

HORNABROOK GRAHAM ALFRED7 citations73