Know Your Diamond
Drop the diamond in water; if it sinks, it's likely real; if it floats, it may be fake
Water Test
Diamonds are the hardest minerals; they can scratch
glass or other gemstones
Hardness Test
Seek an expert gemologist to assess the diamond's
authenticity and quality
Professional Appraisal
Inspect any accompanying certificates and hallmarks
for authenticity
Hallmarks and Certificates