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Diamonds > Diamond Facts that You Should Know

Diamond Facts that You Should Know

When purchasing a diamond, we recommend that you buy with your eyes, not your ears.

A diamond's size/weight is measured in carats. A carat is divided into 100 points. Therefore, a diamond of 75 points weighs .75 carat. Diamond weights apply to both solitaires and multiple stone diamond jewelry.

Adhering to FTC guidelines, please see Robbins Bros Weight Range Standards as listed below.

  • T.W. = total diamond weight. Diamond weights may not be exact. See the chart below for size ranges.

    • 1/10 carat: 09. ~ .11 carat
    • 1/8 carat: .12 ~ .13 carat
    • 1/7 carat: .14 ~ .15 carat
    • 1/6 carat: .16 ~ .17 carat
    • 1/5 carat: .18 ~ .22 carat
    • 1/4 carat: .23 ~ .29 carat
    • 1/3 carat: .30 ~ .36 carat
    • 3/8 carat: .37 ~ .45 carat
    • 1/2 carat: .46 ~ .58 carat
    • 5/8 carat: .59 ~ .69 carat
    • 3/4 carat: .70 ~ .85 carat
    • Lt 1 carat: .86 ~ .94 carat
    • 1 carat: .95 ~ 1.15 carat
    • 1 1/4 carat: 1.20 ~ 1.28 carat
    • 1 1/2 carat: 1.46 ~ 1.69 carat
    • 1 3/4 carat: 1.70 ~ 1.85 carat
    • 2 carat: 1.95 ~ 2.15 carat

    Just remember, buy with your eyes, not your ears.

  • Jewelry may be shown larger than actual size to show beauty of detail.

  • Prices subject to change due to fluctuation of metal and diamond pricing.

  • If you see an item in any of our printed publications but do not see it on-line, call 800-792-5287 to check availability in your area. Please have your catalog number ready.

  • Color gemstones may be treated to enhance their color or durability. This treatment is often not permanent. Ask a Sales Associate at 800-792-5287 about treatment and special care.