Gemology Certification Jewelry Design & Precious Metals

Question 1

What does '18 karat' gold indicate about the metal's composition?

Accepted Answer

75% pure gold and 25% alloy metals

Answer

18 karat gold contains 18 parts gold out of 24 total parts, making it 75% pure gold (18/24 = 0.75), with the remaining 25% consisting of alloy metals such as copper, silver, or palladium.

Question 2

What is the primary advantage of using platinum over white gold for gem settings in fine jewelry?

Accepted Answer

Platinum is denser, more durable, and hypoallergenic with no replating required

Answer

Platinum is naturally white, hypoallergenic, extremely dense and durable, and does not need rhodium plating to maintain its white color, unlike white gold which requires periodic replating.

Question 3

In jewelry, what does the term 'prong setting' describe?

Accepted Answer

Metal claws that grip the girdle of a gemstone to hold it in place

Answer

A prong (or claw) setting uses small metal projections — typically four or six — that are bent over the girdle of the stone to secure it while exposing the maximum amount of the gem to light.

Question 4

What is 'sterling silver' and what is its fineness mark?

Accepted Answer

92.5% pure silver alloyed with 7.5% copper, marked 925

Answer

Sterling silver is a standard alloy of 92.5% pure silver and 7.5% other metals (usually copper), stamped with the hallmark '925' to indicate its fineness.

Question 5

What setting type completely surrounds the girdle of a gemstone with a continuous wall of metal?

Accepted Answer

Bezel setting

Answer

A bezel setting encircles the entire girdle of the gemstone with a custom-fitted metal collar, offering strong protection for the stone's edges and a sleek, modern appearance.

Gemology Certification Practice Test

Gemology Certification Practice Test

Gemology Certification Jewelry Design & Precious Metals