There truly is no sparkle like the sparkle of a crystal clear diamond.

The birthstone for the month of April is definitely not reserved for April babies only!

Diamonds are worn as symbols of love and devotion; they represent wealth and power and they are passed down from generation to generation. Diamonds have their own histories and stories—mythological and mysterious, and have been worn and prized since humans discovered the mystical stones.



Three billion years old and made of pure carbon, diamonds were created in the earth’s upper mantle under heat and pressure and carried to the earth’s surface by volcanic action. Formed as a cubic crystal with refraction unlike any other mineral, when cut and polished a flawless diamond will refract 100% of all the light beams back to the viewer.

Compared to other minerals a diamond is rated the highest ( a ten)  on the Mohs scale for hardness. Hardness of a mineral refers to the ability to scratch the surface, ten being the most difficult. However, a diamond can chip, cleave or crack easily if it is ‘hit’ at a certain angle with force. Diamonds can also burn at temperatures above 750 degrees Celsius and a sudden change in extreme temperatures can cause internal fractures.

Primary diamond deposits are called ‘diamondiferous pipes’ which are solidified Kimberlite, (a potassic volcanic rock) or Lamproite, (formed from partially melted mantle at depths of over 150 km). Secondary diamond deposits are places where the diamonds have been transferred to from their original source via natural causes. Diamond deposits are found all over the world, including Botswana, Russia, Canada, South Africa and Australia. They are in deserts, frozen tundra and ocean beds.

Flawless diamonds or diamonds with few inclusions are extremely rare and expensive.  Impurities causing irregular crystal growths within diamonds are referred to as flaws or inclusions. Only about 20% of all diamonds found worldwide are good enough for jewelry and only about 1% of those are of the highest quality and clear of inclusions.

When diamonds are extracted from the ground they are translucent or opaque and are rough in appearance. The diamond cutter will determine the best shape to cut from each stone to maximize the weight, symmetry and ideal proportions for light refraction. The cutter will then cleave the diamond, which is splitting it along its natural crystal grain, facet the rough diamond and will finish the process with an overall polishing.


A ‘brilliant cut’ is the most reflective of all the diamond cuts. When cut to ideal proportions, the facets start at a central point and radiate towards the edges, there are fifty-seven facets and are referred to as a full cut. A single cut diamond has seventeen facets. Small diamonds called a ‘chip’ is a common misnomer.

Jeff Deleuse, Graduate Gemologist, has written an informative post on how to buy a diamond, which includes the explanation of the 4C’s, cut, clarity, color, and carat. 

Janet Deleuse, All Rights Reserved

American Gem Trade Association, Reference Guide, Diamonds, Gemstones, Pearls and Precious Metals, July 2009

Shop the Collection For Diamond Rings 

Previous Article Next Article
“Janet, thank-you for everything you do. As I said before, you are truly an artist, and that is why it is so special buying jewelry from you.” Peter, Atlanta, GA

” Beauty, exquisite design, pleasant and personalized attention. These qualities have been constant in our 20 years of shopping with Janet and Jeff Deleuse – Two exceptionally talented and caring people. The Best!’ Helen P.,Belvedere

"This store has a very pleasant environment and Jeff and Janet are both kind, wonderful people. I used Jeff a few times for appraisals and he was very thorough and was happy to answer lots of questions. He uses scientific methods and tests rather than going solely by appearance as some jewelers will try to do, and his expertise is well respected. On one occasion, he even went out of his way to help expedite a deal for me. He has my highest recommendation. Suzanne T., San Rafael, CA

“Jeff is an incredible gemologist who knows everything there is to know about gem stones. He is a true professional and can be trusted. The quality of their work is impeccible and always consistent. I would recommend Deleuse Jewelers to anyone looking for a new, “bauble,” for themselves or someone special!” Terri B., Ross

"I have used Deleuse Jewelers for many years - for everything from purchasing jewelry to repairing jewelry to getting appraisals on jewelry. Their service and work is superb. I highly recommend them." Suzanne S., Tiburon, CA

"I purchased this beautiful chain from Janet Deleuse about 3 weeks ago. It was an online purchase so I was hoping I would be pleased. It exceeded my expectations as it was exactly as pictured. Delicate and perfectly crafted. Packing was very secure and shipping was quick. I would not hesitate to purchase from Deleuse again! Michele, New Jersey

“Janet and Jeff designed and crafted our wedding rings and did a great job. They worked with existing diamonds we had in an antique ruby cocktail ring, added the sapphire stone and made a beautiful pendant with the ruby. In addition, they designed earrings for our daughters. All are still in great shape today. They are easy to work with and very reliable and trustworthy.” Peg M., San Anselmo

Accreditation includes diplomas from the Gemological Institute of America and the American Gem Society and thirty years of experience.

Recently Viewed