"Heishi," "spacer," and "tyre" gemstones refer to specific types of beads used in jewelry making. Here's a description for each:

1. **Heishi Gemstones:**
Heishi beads are disc-shaped or tube-shaped gemstones that have been drilled with a hole in the center for stringing. These beads are traditionally made from materials like turquoise, shell, coral, or various gemstones such as lapis lazuli, jade, or jasper. They are cut into uniform shapes and sizes, creating a smooth and consistent appearance when strung together. Heishi beads are often used in Native American jewelry and can add a colorful and distinctive touch to necklaces, bracelets, and earrings.

2. **Spacer Gemstones:**
Spacer beads are small, often decorative, and used to separate or "space out" other beads in jewelry designs. They come in various shapes, sizes, and materials, such as metal, glass, ceramic, or gemstones like quartz, agate, or amethyst. Spacer beads can add visual interest, texture, and contrast to jewelry pieces while providing a break between larger or more elaborate beads.

3. **Tyre Gemstones:**
Tyre beads, also known as tire-shaped beads, are cylindrical or barrel-shaped gemstones with a rounded edge and a central hole for threading. These beads mimic the appearance of a tire or wheel, hence the name. They come in different materials like various gemstones, crystals, or glass. Tyre beads offer a unique and contemporary look to jewelry designs and can be used as focal points or as accents in necklaces, bracelets, or earrings.

Each of these types of gemstone beads serves a specific purpose in jewelry making, contributing to the overall aesthetics, design, and style of the piece. They offer versatility in creating diverse and visually appealing jewelry designs for both casual and formal occasions.