diff --git a/src/traces/cone/attributes.js b/src/traces/cone/attributes.js
index 438c45e4435..104c2462452 100644
--- a/src/traces/cone/attributes.js
+++ b/src/traces/cone/attributes.js
@@ -80,9 +80,28 @@ var attrs = {
         description: 'Sets the z coordinates of the vector field mesh.'
     },
 
-    // TODO
-//     sizemode: {},
-//     sizeref: {},
+    sizemode: {
+        valType: 'enumerated',
+        values: ['scaled', 'absolute'],
+        role: 'info',
+        editType: 'calc',
+        dflt: 'scaled',
+        description: [
+            'Sets the mode by which the cones are sized.',
+            'If *scaled*, `sizeref` scales such that the reference cone size',
+            'for the maximum vector magnitude is 1.',
+            'If *absolute*, `sizeref` scales such that the reference cone size',
+            'for vector magnitude 1 is one grid unit.'
+        ].join(' ')
+    },
+    sizeref: {
+        valType: 'number',
+        role: 'info',
+        editType: 'calc',
+        min: 0,
+        dflt: 1,
+        description: 'Sets the cone size reference value.'
+    },
 
     text: {
         valType: 'string',
diff --git a/src/traces/cone/defaults.js b/src/traces/cone/defaults.js
index 342d10fc874..9f44361b387 100644
--- a/src/traces/cone/defaults.js
+++ b/src/traces/cone/defaults.js
@@ -39,7 +39,8 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     coerce('vy');
     coerce('vz');
 
-    coerce('text');
+    coerce('sizeref');
+    coerce('sizemode');
 
     // TODO do these attributes work?
     coerce('lighting.ambient');
@@ -57,6 +58,8 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     // ... and should we restrict cmin,cmax > 0 ???
     colorscaleDefaults(traceIn, traceOut, layout, coerce, {prefix: '', cLetter: 'c'});
 
+    coerce('text');
+
     // disable 1D transforms
     // x/y/z should match lengths, u/v/w and vx/vy/vz  should match as well, but
     // the two sets have different lengths so transforms wouldn't work.
diff --git a/src/traces/cone/helpers.js b/src/traces/cone/helpers.js
index 853d1314544..0b500e0663d 100644
--- a/src/traces/cone/helpers.js
+++ b/src/traces/cone/helpers.js
@@ -21,6 +21,7 @@ function zip3(x, y, z) {
 }
 
 var axisName2scaleIndex = {xaxis: 0, yaxis: 1, zaxis: 2};
+var sizeMode2sizeKey = {scaled: 'coneSize', absolute: 'absoluteConeSize'};
 
 exports.cone2mesh = function cone2mesh(trace, sceneLayout, dataScale) {
     var coneOpts = {};
@@ -61,9 +62,7 @@ exports.cone2mesh = function cone2mesh(trace, sceneLayout, dataScale) {
     coneOpts.colormap = parseColorScale(trace.colorscale);
     coneOpts.vertexIntensityBounds = [trace.cmin, trace.cmax];
 
-    // sizemode:
-    // sizeref,
-    coneOpts.coneSize = 2;
+    coneOpts[sizeMode2sizeKey[trace.sizemode]] = trace.sizeref;
 
     return conePlot(coneOpts);
 };
diff --git a/test/image/baselines/gl3d_cone-simple.png b/test/image/baselines/gl3d_cone-simple.png
index 50683cfb6ca..cbf3d65d3ee 100644
Binary files a/test/image/baselines/gl3d_cone-simple.png and b/test/image/baselines/gl3d_cone-simple.png differ
diff --git a/test/image/baselines/gl3d_cone-sparse.png b/test/image/baselines/gl3d_cone-sparse.png
index 779a4846263..873f944bad8 100644
Binary files a/test/image/baselines/gl3d_cone-sparse.png and b/test/image/baselines/gl3d_cone-sparse.png differ
diff --git a/test/image/mocks/gl3d_cone-simple.json b/test/image/mocks/gl3d_cone-simple.json
index 0b1d089a989..d96cef6ff1a 100644
--- a/test/image/mocks/gl3d_cone-simple.json
+++ b/test/image/mocks/gl3d_cone-simple.json
@@ -1,20 +1,22 @@
 {
   "data": [
-	{
-	  "type": "scatter3d",
-	  "mode": "markers",
+    {
+      "type": "scatter3d",
+      "mode": "markers",
       "x": [1, 2, 3],
       "y": [1, 2, 3],
       "z": [1, 2, 3]
-	},
+    },
     {
       "type": "cone",
       "x": [1, 2, 3],
       "y": [1, 2, 3],
       "z": [1, 2, 3],
-      "u": [0.1, 0, 0],
-      "v": [0, 0.3, 0],
-      "w": [0, 0, 0.2]
+      "u": [1, 0, 0],
+      "v": [0, 3, 0],
+      "w": [0, 0, 2],
+      "sizemode": "absolute",
+      "sizeref": 2
     }
   ],
   "layout": {