Tessellator tessellator = Tessellator.getInstance();
    WorldRenderer wr = tessellator.getWorldRenderer();

    GlStateManager.pushMatrix();
    GlStateManager.disableCull();

    GlStateManager.translate(x + 0.5f, y, z + 0.5f);

    // if(te.gem != null){
      GlStateManager.disableLighting();
      GlStateManager.color(1, 0, 0, 1);

      wr.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION_COLOR);

      wr.pos(1, 0, 0).color(1,1,0,1).endVertex();
      wr.pos(0, 0, 0).endVertex();
      wr.pos(0, 1, 0).endVertex();
      wr.pos(1, 1, 0).endVertex();
      tessellator.draw();

      GlStateManager.enableLighting();
    // }

    GlStateManager.popMatrix();