The term "conflict diamonds" refers to the diamond rough used to fund violent criminal insurgencies in several African countries.
The Kimberley Accord is a compact that regulates the sale and transfer of diamond rough to prevent the human destruction that conflict
diamonds cause. Rio Grande has long asked our suppliers to provide documentation proving the safe origin of the diamonds we buy.
You can be assured every diamond you buy from Rio Grande is certified “conflict-free” by both our strict standards and the Kimberley Accord.
Our Rio Graduate Gemologists are ready to help you match stones or select a specific quality. Please let them know how they can help you.
please note: Solder with confidence; all solder sold by Rio Grande has been cadmium-free since the late sixties, when the health risks of this element became known.
How To Solder More Successfully
These tips can help you solder more successfully and more reliably . . . every time. They are so simple, but it can be too easy to let the little things slip our minds as we work through our processes.
• Use the least amount of solder needed to make a good joint. Do not flood the joint with solder.
• Pieces to be soldered should fit tightly together with no air space in between.
• Make sure the joint and the solder are clean. Prior to soldering, flux all surfaces well to prevent oxidation, which can inhibit solder flow.
The Basics On How To Solder Effectively
Here's how to solder effectively using the basic skills for soldering. Follow these steps to ensure strong, long-lasting joint.
Clean Solder won’t flow on a dirty or greasy surface. Use a de-greasing detergent cleaner and an abrasive pad, or an abrasive such as pumice powder to remove dirt or grease from the metal being soldered. Rinse thoroughly after cleaning. You can also steam-clean the workpieces.
Fit Components, findings and joints must fit tightly together. Gaps in joints and poorly matched junctures between parts create a poor solder joint, which could result in pitting of the solder or in a weak joint that could break. Occasionally, solder simply will not fill a poor-fitting area.
Flux Flux prepares the metal surface to receive the fluid solder. When applying flux, make sure it is in contact with the solder at all times and that it touches both metal parts being joined. Some self-pickling fluxes also help dissolve oxides. Keeping the joint oxide-free is important for creating the ideal soldering surface.
Flame Use either a neutral flame (equal parts oxygen and gas) or a reducing flame (more gas than oxygen). The metal adjacent to the joint must reach the necessary temperature before solder will flow. First concentrate the heat on the surrounding surface, then on the joint to be soldered. Remember, solder flows to the hottest part of the surface and toward the flame.
Follow-Up After soldering, use a mild acid pickle to clean nonferrous metals. This removes oxides and other soldering residues prior to finishing. When storing solders, keep them free from dirt and grease. Sheet solders may be cleaned to remove dirt or residue.
Brown & Sharpe Gauge Thicknesses
Use this handy guide to quickly, easily and accurately convert gauge sizes into inches or millimeters—or vice versa.
As a wholesale supplier to jewelers and other industry professionals, Rio Grande wants to avoid presenting wholesale pricing to retail consumers. In addition, the U.S. Patriot Act requires all suppliers of precious metals to maintain full contact information for all of its customers.
Please be aware that we vigilantly protect your account information—it will never be shared or sold to any third party for any reason, ever.
The benefits of having a dedicated account with us include:
See current pricing on all products based on published daily metal markets.
Access and print your order history and invoices any time you need them.
Create and update a 'wish' list of products you have selected but are not yet ready to purchase.
Manage and update your account information, including contact and payment information, at your convenience.