Gemstones are valued based on the Four Cs - color, clarity, cut, and carat. Precious stones include diamonds, sapphires, rubies, and emeralds. Semi-precious stones are evaluated on their rarity and ...

GIA’s laboratories use advanced instrumentation and research to deliver accurate grading, identification, and origin ...

He covers the scarcity and value of diamonds and uncut gems, and he describes how thieves ... A triangle pointing right which indicates this type of media can be played. Bryan Sobolewski was ...

Chalcedonies include many types of cryptocrystalline quartz ... There are a number of semiprecious gems, many quite beautiful, but diamonds, rubies, sapphires, and emeralds continue to qualify ...

A big, beautiful diamond. Sure, it catches light like no other gem, and it's the hardest material ... proton and neutron from scratch, using two types of quarks—up quarks and down quarks.

To keep waste to a minimum, the team work with the rare 2% of naturally occurring triangular diamonds, cutting vivid gems in a modern new shape. With five successful businesses to her name by the ...