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Avogadro's Tie Bar

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Avogadro's constant: "the number of elementary entities per mole of substance". It's a big number...which is to say, there's a lot of stuff in the universe. Wear a piece of it with this hand-stamped tie bar.

Available in aluminum or bronze, it is sturdy enough to last a lifetime. (Note that hand-stamped lettering varies a little, so yours will be charmingly unique.)

Perfect for:

  • Chemists of all types
  • Molecular biologists
  • Science teachers
  • Mole Day celebrators
  • Big Bang Theory fans (and yes, that tie bar on Stephen Merchant is from us (!!))
  • Anyone who appreciates both the extraordinarily vast and exquisitely infinitesimal nature of the universe

Customer Reviews

Based on 8 reviews
Laurie Rosato
Great Service!

I ordered a tie bar and received it only 2 days later...in plenty enough time for our last day of school gift exchange! The gift was well received!

Amy Ornelas
Avogadros constant tie bar

Other than needing a spring instead of straight across, keep having to adjust. It is great, conversation starter for sure!!!

Bryan G.
Avogadro would be proud

Excellent product, ordered from the UK arrived less than a week

Athena P.
Great Tie Clip

Bought this for my husband as a present in the gold/bronze color. It is a gorgeous color and we were both very happy with the quality of the product. He loves it. It arrived quickly and in a beautiful box. I would definitely recommend this company and product.

Donna-Mae Villanueva
Excellent gift idea!

Thank you for the wonderful ideas you design. They make great gifts and are so appreciated by my friends.

FREE SHIPPING for orders over $45 within the United States. Buy several items-- keep some and give others as gifts!

If you don't quite hit the $45 total, First Class delivery within the U.S. is $3.50 per order, and Priority is $8 per order. Gift boxes are ALWAYS included for orders within the U.S. Orders are processed and mailed within 2 business days. Near holidays, we often mail out same-day.

 UNITED STATES mailed withinin transit for from ordering to arrival 
 Priority Mail  1-2 business days  2 - 4 business days  3 - 6 business days 
First Class  1-2 business days  3 - 5 days  4 - 7 business days

International Shipping

All international orders are shipping in individual black velvet gift bags instead of gift boxes to cut shipping costs. Please see your country below for shipping options. We do not currently ship to the European Union. The customer is responsible for any VAT or import tax charges.

 AUSTRALIA & NEW ZEALANDCost Shipping TimeTracking Code
USPS First Class InternationalNot Available Not AvailableNot Available
GlobalPost Economy$20Less than 4 weeksTracks the entire delivery
CostShipping TimeTracking Code
USPS First Class International$10    Up to 8 weeksTracks up to your country's border
GlobalPost Economy$20    Less than 4 weeks

Tracks the entire

We do not currently ship to the European Union.


We are so sure that you (or your lucky gift recipient) will love our jewelry that we have a 100% Satisfaction Guarantee! If you are unhappy with your order for any reason, even if you just decided it wasn't your style after all, simply mail back your undamaged, unworn jewelry and we will give you a full refund minus shipping. Check our reviews... our goal is to get ALL THE STARS. If you have any kind of problem with your order, please email us at maile@boutiqueacademia.com. We want all of our customers to be completely satisfied!