How can you measure the hardness of a gem stone?
melanin amount classified inches Weigh it on a scale Scratch it Trigonometry Break it open Leave it in the sun
A B C D E F G H
Most gem stones are hard minerals.
You can measure the hardness of a gem stone by scratching it
How can you measure the hardness of a gem stone? (A) melanin amount (B) classified (C) inches (D) Weigh it on a scale (E) Scratch it (F) Trigonometry (G) Break it open (H) Leave it in the sun