If your mother is the Jewelry type there's a number of responsible jewelry options that will satisfy any tastes. Here are just a few...

If mom has traditional tastes you can get her some "conflict free" diamonds from Brilliant Earth. Brilliant Earth is committed to eco-friendly and fair labor practices. They use only certified conflict free diamonds from Canada plus they donate 5% of their profits to help local African communities that are known for being exploited by the diamond trade. They have also partnered with the environmental nonprofit One Sky and the Conservation Society of Sierra Leone (CSSL) to support redevelopment efforts in Kono, the diamond mining region in Sierra Leone.

If mom has more eclectic tastes you can try something from Moonrise Jewelry. Moonrise sources all of their materials from Fair Trade and ethical vendors who...

• Promote economic development with fair labor practices
• Protect workers' rights and health
• Advance equal opportunities for both women and men
• Comply with environmental protection standards
• Choose recycled, reclaimed, and renewable materials
• Preserve and perpetuate traditional art forms and local culture

You can read more about their efforts on their site.

If mom's tastes are chic and edgy you can get her something from BATUCADA. Each piece from BATUCADA is made from their own “Eco-plastic” which is basically an synthetic rubber made from eco-friendly certified components. They come together to create this tough but flexible material that silkily forms to the contours of your body. Because of their pliable nature these pieces can be transformed from a necklace to bracelet, to anklet, to arm band… They come in a variety of colors and styles, and are packaged in Green packaging made from recycled paper.