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The Castle Jewelry provides training to its employees on a biweekly basis and we love being able to pass our knowledge along to you! From diamonds and Rolexes to learning how to use a loupe, our team of specialists will teach you everything you need to know! If you’re interested in learning about anything in particular that we do not have listed, feel free to ask! We would be happy to share our know-how with you.

Learn more by visiting our Blogs page.

The Four C’s in a Nutshell

The 3 requirements of a gemstone are:

Durability, Rarity, Beauty

The scale which we measure hardness is:

The Moh’s Scale

  • Diamond
  • Corundum (Ruby & Sapphire)
  • Topaz
  • Quartz
The Four C’s are:

Cut, Color, Clarity, Carat

“Carat” refers to diamond weight

Carat comes from “Carob Bean”. 1 Carat = .2 Grams

“Karat” refers to:

gold percentage

The American Round Brilliant became commonly cut in:


The Round Brilliant Cut has:

58 Facets

There are 33 crown facets on the RBC
  • 1 Table
  • 8 Star Facets
  • 8 Bezel Facets
  • 16 Upper Girdle Facet
There are 25 pavilion facets on the RBC
  • 1 Culet
  • 8 Pavilion Main Facets
  • 8 Bezel Facets
  • 16 Lower Girdle Facets
The outer edge of the diamond is called:

the “Girdle”

The optimal crown angle is:

34.5 degrees

Brilliance is...

the white light reflected off the facets and back up through the table

Scintillation is...

the movement of colors and light as the stone or light source is moved

Diamonds are graded under:

10 power magnification

What are Inclusions and blemishes?

Inclusions are imperfections inside the diamond and blemishes are on the surface of the stone

The 5 factors that are taken in consideration when determining clarity are:
  • Size
  • Nature
  • Color
  • Location
  • Number
The three colors we look for when grading color are:
  • Yellow
  • Grey
  • Brown
Colorless Diamonds have a color grade of:
  • D
  • E
  • F
Near Colorless Diamonds have a color grade of:
  • G
  • H
  • I
  • J

Be The First To Know!

Make an Appointment

Let us know what time works best and we will be here to answer any questions. Our online jewelry is located at our New Circle Rd store in Lexington, Kentucky but most of our jewelry is not on the sales floor so we will need a scheduled time to have it prepared for you to see.

For same-day appointments, please call Allee at (859) 309-0041

example: 11/27/17
example: 1:00pm